Complement component C3b |
complement component C4a |
VQGEESNDK |
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[complement factor C4; complement component C4a] C4, encoded by two closely related and highly polymorphic genes, C4A [complement component 4A] and C4B [complement component 4B; complement component C4b]. C4A and C4B show markedly different, class-specific, chemical reactivities and also differ serologically in that C4A generally expresses the Rodgers blood group antigens while C4B generally expresses the Chido blood group antigens (Yu et al, 1986; Schifferli and Paccaud, 1989; Blanchong et al, 2001). C4 is a non-enzymatic component of the C3 and
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