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Human tryptic C4d of the Chido and Rodgers variant was fragmented by cyanogen bromide and trypsin. The fragments were characterized by amino acid analysis and sequence determination. Polymorphism between the two genetic variants was detected in 5 positions. Four were closely located (residues 141, 142, 145, 146), where Leu, Ser, Ile, His occurred in the Chido variant and Pro, Cys, Leu, Asp in the Rodgers variant, respectively. In position 94 Gly was found in Chido and Asp in Rodgers. Alignment of the fragments was performed and it is concluded that tryptic C4d of both variants contains 346 residues.
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