Hetero decameric assembly 1 of PDB entry 7z0o coloured by chemically distinct molecules, front view. This structure contains:

• 2 copies of Histone H3;
• 1 copy of Histone H4;
• 1 copy of RNA polymerase I-specific transcription initiation factor RRN5;
• 1 copy of RNA polymerase I-specific transcription initiation factor RRN9;
• 1 copy of RNA polymerase I-specific transcription initiation factor RRN10;
• 1 copy of Upstream activation factor subunit UAF30;
• 1 copy of TATA-box-binding protein;
• 1 copy of Non-template DNA;
• 1 copy of Template DNA.