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Isoelectric focusing has revealed that human complement factor I (CFI) is controlled by two polymorphic alleles, CFI*A and CFI*B, and a few rare variant alleles. In this study the molecular basis of the CFI polymorphism was investigated in 174 Japanese. The CFI*A was divided into two suballeles, CFI*As (R201S) and CFI*Ah (R406H). CFI*Aj, a rare variant allele originating from CFI*Ah, had an additional...
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