complement component c3 prepared by the method of tack & prahl [ ( 1976 ) biochemistry 15 , 4513-4521 ] was found to contain the following trace contaminants : c3b , haemolytically inactive c3 with intact alpha- and beta-chains ( c3u ) and degraded c3 ( apparent mol.wt . 140000 ) with an intact beta-chain but with a fragmented alpha-chain .
C0009506
complement component c3
C0009511
c3b