title: Evidence for the implication of histidines-40 and -92 in the active site of ribonuclease T1.
mesh_terms: D000478:Alkylation; D000596:Amino Acids / Q000032:analysis; D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D004720:Endonucleases / Q000032:analysis; D006150:Guanine Nucleotides; D006639:Histidine / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007461:Iodoacetates; D012260:Ribonucleases / Q000032:analysis / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D006150:Guanine Nucleotides; D007461:Iodoacetates; D006639:Histidine; D004720:Endonucleases; D012260:Ribonucleases