Nature of the active site of a subunit of the first component of human complement.
D000578:Amidines; D001665:Binding Sites; D002118:Calcium; D055598:Chemical Phenomena; D002621:Chemistry; D003169:Complement Inactivator Proteins; D003165:Complement System Proteins; D004952:Esters; D006146:Guanidines; D006801:Humans; D007700:Kinetics; D008274:Magnesium; D009596:Nitrophenols; D013053:Spectrophotometry; D014443:Tyrosine
D000578:Amidines; D003169:Complement Inactivator Proteins; D004952:Esters; D006146:Guanidines; D009596:Nitrophenols; D014443:Tyrosine; D003165:Complement System Proteins; D008274:Magnesium; D002118:Calcium