Function and Biology Details
Biochemical function:
- not assigned
Biological process:
- not assigned
Cellular component:
- not assigned
Structure analysis Details
Assembly composition:
hetero 75-mer (preferred)
PDBe Complex ID:
PDB-CPX-269441 (preferred)
Entry contents:
71 distinct polypeptide molecules
4 distinct RNA molecules
4 distinct RNA molecules
Macromolecules (75 distinct):
Ribosomal protein L8
Chain: LA
Molecule details ›
Chain: LA
Length: 251 amino acids
Theoretical weight: 27.09 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 251 amino acids
Theoretical weight: 27.09 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L3
Chain: LB
Molecule details ›
Chain: LB
Length: 379 amino acids
Theoretical weight: 42.72 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 379 amino acids
Theoretical weight: 42.72 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L4
Chain: LC
Molecule details ›
Chain: LC
Length: 316 amino acids
Theoretical weight: 35.05 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 316 amino acids
Theoretical weight: 35.05 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L5
Chain: LF
Molecule details ›
Chain: LF
Length: 297 amino acids
Theoretical weight: 33.96 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 297 amino acids
Theoretical weight: 33.96 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L39
Chain: LG
Molecule details ›
Chain: LG
Length: 51 amino acids
Theoretical weight: 6.35 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 51 amino acids
Theoretical weight: 6.35 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L7
Chain: LH
Molecule details ›
Chain: LH
Length: 235 amino acids
Theoretical weight: 27.1 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 235 amino acids
Theoretical weight: 27.1 KDa
Source organism: Giardia lamblia ATCC 50803
60S ribosomal protein L7a
Chain: LI
Molecule details ›
Chain: LI
Length: 225 amino acids
Theoretical weight: 25.43 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 225 amino acids
Theoretical weight: 25.43 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L6
Chain: LJ
Molecule details ›
Chain: LJ
Length: 185 amino acids
Theoretical weight: 20.89 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 185 amino acids
Theoretical weight: 20.89 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L10
Chain: LK
Molecule details ›
Chain: LK
Length: 210 amino acids
Theoretical weight: 24.28 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 210 amino acids
Theoretical weight: 24.28 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L11
Chain: LL
Molecule details ›
Chain: LL
Length: 173 amino acids
Theoretical weight: 19.77 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 173 amino acids
Theoretical weight: 19.77 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L13
Chain: LM
Molecule details ›
Chain: LM
Length: 234 amino acids
Theoretical weight: 26.64 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 234 amino acids
Theoretical weight: 26.64 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L14
Chain: LN
Molecule details ›
Chain: LN
Length: 131 amino acids
Theoretical weight: 14.79 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 131 amino acids
Theoretical weight: 14.79 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L15
Chain: LO
Molecule details ›
Chain: LO
Length: 204 amino acids
Theoretical weight: 24.35 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 204 amino acids
Theoretical weight: 24.35 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L13a
Chain: LP
Molecule details ›
Chain: LP
Length: 197 amino acids
Theoretical weight: 22.92 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 197 amino acids
Theoretical weight: 22.92 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L17
Chain: LQ
Molecule details ›
Chain: LQ
Length: 164 amino acids
Theoretical weight: 18.72 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 164 amino acids
Theoretical weight: 18.72 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L18
Chain: LR
Molecule details ›
Chain: LR
Length: 179 amino acids
Theoretical weight: 20.21 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 179 amino acids
Theoretical weight: 20.21 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L19
Chain: LS
Molecule details ›
Chain: LS
Length: 196 amino acids
Theoretical weight: 23.2 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 196 amino acids
Theoretical weight: 23.2 KDa
Source organism: Giardia lamblia ATCC 50803
60S ribosomal protein L18a
Chain: LT
Molecule details ›
Chain: LT
Length: 173 amino acids
Theoretical weight: 20.62 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 173 amino acids
Theoretical weight: 20.62 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L21
Chain: LU
Molecule details ›
Chain: LU
Length: 159 amino acids
Theoretical weight: 18.3 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 159 amino acids
Theoretical weight: 18.3 KDa
Source organism: Giardia lamblia ATCC 50803
Large ribosomal subunit protein eL22
Chain: LV
Molecule details ›
Chain: LV
Length: 124 amino acids
Theoretical weight: 14.43 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 124 amino acids
Theoretical weight: 14.43 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L23
Chain: LW
Molecule details ›
Chain: LW
Length: 142 amino acids
Theoretical weight: 15.45 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 142 amino acids
Theoretical weight: 15.45 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L24e
Chain: LX
Molecule details ›
Chain: LX
Length: 189 amino acids
Theoretical weight: 22.75 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 189 amino acids
Theoretical weight: 22.75 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L23A
Chain: LY
Molecule details ›
Chain: LY
Length: 141 amino acids
Theoretical weight: 16.05 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 141 amino acids
Theoretical weight: 16.05 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L26
Chain: LZ
Molecule details ›
Chain: LZ
Length: 135 amino acids
Theoretical weight: 15.62 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 135 amino acids
Theoretical weight: 15.62 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L27
Chain: La
Molecule details ›
Chain: La
Length: 135 amino acids
Theoretical weight: 15.37 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 135 amino acids
Theoretical weight: 15.37 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L27a
Chain: Lb
Molecule details ›
Chain: Lb
Length: 149 amino acids
Theoretical weight: 17.17 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 149 amino acids
Theoretical weight: 17.17 KDa
Source organism: Giardia lamblia ATCC 50803
60S ribosomal protein L29
Chain: Lc
Molecule details ›
Chain: Lc
Length: 62 amino acids
Theoretical weight: 7.36 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 62 amino acids
Theoretical weight: 7.36 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L30
Chain: Ld
Molecule details ›
Chain: Ld
Length: 109 amino acids
Theoretical weight: 11.7 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 109 amino acids
Theoretical weight: 11.7 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L31e
Chain: Le
Molecule details ›
Chain: Le
Length: 106 amino acids
Theoretical weight: 12.18 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 106 amino acids
Theoretical weight: 12.18 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L32
Chain: Lf
Molecule details ›
Chain: Lf
Length: 136 amino acids
Theoretical weight: 15.99 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 136 amino acids
Theoretical weight: 15.99 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L35a
Chain: Lg
Molecule details ›
Chain: Lg
Length: 123 amino acids
Theoretical weight: 13.91 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 123 amino acids
Theoretical weight: 13.91 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L34
Chain: Lh
Molecule details ›
Chain: Lh
Length: 120 amino acids
Theoretical weight: 13.53 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 120 amino acids
Theoretical weight: 13.53 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L29
Chain: Li
Molecule details ›
Chain: Li
Length: 124 amino acids
Theoretical weight: 14.29 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 124 amino acids
Theoretical weight: 14.29 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L36e
Chain: Lj
Molecule details ›
Chain: Lj
Length: 90 amino acids
Theoretical weight: 10.59 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 90 amino acids
Theoretical weight: 10.59 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L37
Chain: Lk
Molecule details ›
Chain: Lk
Length: 89 amino acids
Theoretical weight: 10.33 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 89 amino acids
Theoretical weight: 10.33 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal L38e
Chain: Ll
Molecule details ›
Chain: Ll
Length: 77 amino acids
Theoretical weight: 8.61 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 77 amino acids
Theoretical weight: 8.61 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L10a
Chain: Ln
Molecule details ›
Chain: Ln
Length: 217 amino acids
Theoretical weight: 24.63 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 217 amino acids
Theoretical weight: 24.63 KDa
Source organism: Giardia lamblia ATCC 50803
60S ribosomal protein L41
Chain: Lo
Molecule details ›
Chain: Lo
Length: 25 amino acids
Theoretical weight: 3.28 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 25 amino acids
Theoretical weight: 3.28 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L44
Chain: Lp
Molecule details ›
Chain: Lp
Length: 106 amino acids
Theoretical weight: 12.31 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 106 amino acids
Theoretical weight: 12.31 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein L37a
Chain: Lq
Molecule details ›
Chain: Lq
Length: 94 amino acids
Theoretical weight: 10.51 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 94 amino acids
Theoretical weight: 10.51 KDa
Source organism: Giardia lamblia ATCC 50803
50S ribosomal protein L40e
Chain: Ls
Molecule details ›
Chain: Ls
Length: 127 amino acids
Theoretical weight: 14.34 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 127 amino acids
Theoretical weight: 14.34 KDa
Source organism: Giardia lamblia ATCC 50803
Small ribosomal subunit protein uS2
Chain: SA
Molecule details ›
Chain: SA
Length: 245 amino acids
Theoretical weight: 28.1 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 245 amino acids
Theoretical weight: 28.1 KDa
Source organism: Giardia lamblia ATCC 50803
Small ribosomal subunit protein uS5
Chain: SB
Molecule details ›
Chain: SB
Length: 242 amino acids
Theoretical weight: 26.77 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 242 amino acids
Theoretical weight: 26.77 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S3
Chain: SC
Molecule details ›
Chain: SC
Length: 217 amino acids
Theoretical weight: 24.78 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 217 amino acids
Theoretical weight: 24.78 KDa
Source organism: Giardia lamblia ATCC 50803
Small ribosomal subunit protein eS1
Chain: SD
Molecule details ›
Chain: SD
Length: 248 amino acids
Theoretical weight: 28.41 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 248 amino acids
Theoretical weight: 28.41 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S4
Chain: SE
Molecule details ›
Chain: SE
Length: 268 amino acids
Theoretical weight: 30.46 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 268 amino acids
Theoretical weight: 30.46 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S5
Chain: SF
Molecule details ›
Chain: SF
Length: 190 amino acids
Theoretical weight: 21.06 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 190 amino acids
Theoretical weight: 21.06 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S6
Chain: SG
Molecule details ›
Chain: SG
Length: 248 amino acids
Theoretical weight: 28.08 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 248 amino acids
Theoretical weight: 28.08 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S7
Chain: SH
Molecule details ›
Chain: SH
Length: 190 amino acids
Theoretical weight: 21.79 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 190 amino acids
Theoretical weight: 21.79 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S8
Chain: SI
Molecule details ›
Chain: SI
Length: 174 amino acids
Theoretical weight: 19.45 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 174 amino acids
Theoretical weight: 19.45 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S15A
Chain: SJ
Molecule details ›
Chain: SJ
Length: 130 amino acids
Theoretical weight: 14.77 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 130 amino acids
Theoretical weight: 14.77 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S9
Chain: SK
Molecule details ›
Chain: SK
Length: 189 amino acids
Theoretical weight: 21.7 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 189 amino acids
Theoretical weight: 21.7 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S10B
Chain: SL
Molecule details ›
Chain: SL
Length: 134 amino acids
Theoretical weight: 15.41 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 134 amino acids
Theoretical weight: 15.41 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S11
Chain: SM
Molecule details ›
Chain: SM
Length: 154 amino acids
Theoretical weight: 18.1 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 154 amino acids
Theoretical weight: 18.1 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S23
Chain: SO
Molecule details ›
Chain: SO
Length: 143 amino acids
Theoretical weight: 15.9 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 143 amino acids
Theoretical weight: 15.9 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S13
Chain: SP
Molecule details ›
Chain: SP
Length: 154 amino acids
Theoretical weight: 17.63 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 154 amino acids
Theoretical weight: 17.63 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S14
Chain: SQ
Molecule details ›
Chain: SQ
Length: 145 amino acids
Theoretical weight: 15.76 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 145 amino acids
Theoretical weight: 15.76 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S15
Chain: SR
Molecule details ›
Chain: SR
Length: 145 amino acids
Theoretical weight: 16.73 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 145 amino acids
Theoretical weight: 16.73 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S16
Chain: ST
Molecule details ›
Chain: ST
Length: 158 amino acids
Theoretical weight: 17.63 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 158 amino acids
Theoretical weight: 17.63 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S17
Chain: SU
Molecule details ›
Chain: SU
Length: 137 amino acids
Theoretical weight: 15.79 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 137 amino acids
Theoretical weight: 15.79 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S18
Chain: SV
Molecule details ›
Chain: SV
Length: 154 amino acids
Theoretical weight: 17.51 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 154 amino acids
Theoretical weight: 17.51 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S19e
Chain: SW
Molecule details ›
Chain: SW
Length: 139 amino acids
Theoretical weight: 15.46 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 139 amino acids
Theoretical weight: 15.46 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S20
Chain: SX
Molecule details ›
Chain: SX
Length: 126 amino acids
Theoretical weight: 14.07 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 126 amino acids
Theoretical weight: 14.07 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S21
Chain: SY
Molecule details ›
Chain: SY
Length: 89 amino acids
Theoretical weight: 9.69 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 89 amino acids
Theoretical weight: 9.69 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S24
Chain: Sb
Molecule details ›
Chain: Sb
Length: 132 amino acids
Theoretical weight: 14.87 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 132 amino acids
Theoretical weight: 14.87 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S25
Chain: Sc
Molecule details ›
Chain: Sc
Length: 88 amino acids
Theoretical weight: 10.12 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 88 amino acids
Theoretical weight: 10.12 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S26
Chain: Sd
Molecule details ›
Chain: Sd
Length: 109 amino acids
Theoretical weight: 12.79 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 109 amino acids
Theoretical weight: 12.79 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S27
Chain: Se
Molecule details ›
Chain: Se
Length: 81 amino acids
Theoretical weight: 9.14 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 81 amino acids
Theoretical weight: 9.14 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S28
Chain: Sg
Molecule details ›
Chain: Sg
Length: 64 amino acids
Theoretical weight: 7.36 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 64 amino acids
Theoretical weight: 7.36 KDa
Source organism: Giardia lamblia ATCC 50803
Ribosomal protein S29e
Chain: Sh
Molecule details ›
Chain: Sh
Length: 51 amino acids
Theoretical weight: 6.14 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 51 amino acids
Theoretical weight: 6.14 KDa
Source organism: Giardia lamblia ATCC 50803
40S ribosomal protein S30
Chain: Sj
Molecule details ›
Chain: Sj
Length: 69 amino acids
Theoretical weight: 7.93 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 69 amino acids
Theoretical weight: 7.93 KDa
Source organism: Giardia lamblia ATCC 50803
5.8S ribosomal RNA
Chain: LD
Molecule details ›
Chain: LD
Length: 143 nucleotides
Theoretical weight: 46.2 KDa
Source organism: Giardia lamblia ATCC 50803
Length: 143 nucleotides
Theoretical weight: 46.2 KDa
Source organism: Giardia lamblia ATCC 50803
5S ribosomal RNA
Chain: LE
Molecule details ›
Chain: LE
Length: 121 nucleotides
Theoretical weight: 38.99 KDa
Source organism: Giardia lamblia ATCC 50803
Sequence domains: 5S ribosomal RNA
Length: 121 nucleotides
Theoretical weight: 38.99 KDa
Source organism: Giardia lamblia ATCC 50803
Sequence domains: 5S ribosomal RNA
Large Subunit rRNA
Chain: Lt
Molecule details ›
Chain: Lt
Length: 2697 nucleotides
Theoretical weight: 874.76 KDa
Source organism: Giardia lamblia ATCC 50803
Sequence domains: Eukaryotic large subunit ribosomal RNA
Length: 2697 nucleotides
Theoretical weight: 874.76 KDa
Source organism: Giardia lamblia ATCC 50803
Sequence domains: Eukaryotic large subunit ribosomal RNA
Small Subunit rRNA
Chain: St
Molecule details ›
Chain: St
Length: 1454 nucleotides
Theoretical weight: 471.23 KDa
Source organism: Giardia lamblia ATCC 50803
Sequence domains: Eukaryotic small subunit ribosomal RNA
Length: 1454 nucleotides
Theoretical weight: 471.23 KDa
Source organism: Giardia lamblia ATCC 50803
Sequence domains: Eukaryotic small subunit ribosomal RNA