complement activation was quantitated in serum and plasma of diabetic and normal subjects by sensitive competitive equilibrium radioimmunoassays ( ria ) for c3a , c4a , c5a , factor b , and a newly described c5 neoantigen ( termed c5 activation antigen , and abbreviated c5-aa ) in a stable 54-kda fragment of c5 .
C0009528
complement activation
C1367710
c5a