title: Structure and refinement of penicillopepsin at 1.8 A resolution.
mesh_terms: D000595:Amino Acid Sequence; D016282:Aspartic Acid Endopeptidases; D010450:Endopeptidases; D006860:Hydrogen Bonding; D008958:Models, Molecular; D011487:Protein Conformation; D014961:X-Ray Diffraction
chemical_list: D010450:Endopeptidases; C022325:aspartic proteinase A; D016282:Aspartic Acid Endopeptidases