PDB entry 5IFR contains the proteins listed below.

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Ubiquitin (PRO_0000396176) UniProt residues in chain B: 153 - 228 View details
Polyubiquitin-B (P0CG47) UniProt residues in chain B: 153 - 228 View details
Ubiquitin-conjugating enzyme E2 D3 (P61077) UniProt residues in chain A: 2 - 149 View details