The human complement system serine proteases C1r and C1s and their proenzymes.
D000595:Amino Acid Sequence; D003166:Complement Activating Enzymes / Q000032:analysis* / Q000378:metabolism; D003167:Complement Activation; D015923:Complement C1r; D003173:Complement C1s; D006801:Humans; D008970:Molecular Weight; D011487:Protein Conformation
D003166:Complement Activating Enzymes; D015923:Complement C1r; D003173:Complement C1s