1BFZ:
reference: Human cytomegalovirus protease complexes its substrate recognition sequences in an extended peptide conformation., LaPlante SR, Aubry N, Bonneau PR, Cameron DR, Lagace L, Massariol MJ, Montpetit H, Plouffe C, Kawai SH, Fulton BD, Chen Z, Ni F, Biochemistry 1998 Jul 7;37(27):9793-801. PMID: 9657693

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