title: Demonstration of the presence of a histidine residue at the active site of streptococcal proteinase.
mesh_terms: D000477:Alkylating Agents; D000596:Amino Acids / Q000032:analysis; D001665:Binding Sites; D003864:Depression, Chemical; D010450:Endopeptidases; D006639:Histidine; D010084:Oxidation-Reduction; D013053:Spectrophotometry; D013291:Streptococcus / Q000201:enzymology*; D013438:Sulfhydryl Compounds
chemical_list: D000477:Alkylating Agents; D000596:Amino Acids; D013438:Sulfhydryl Compounds; D006639:Histidine; D010450:Endopeptidases