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  • Title: Genetic polymorphism of human factor I (C3b inactivator).
    Author: Nakamura S, Abe K.
    Journal: Hum Genet; 1985; 71(1):45-8. PubMed ID: 3897024.
    Abstract:
    Genetic polymorphism of human factor I (C3b inactivator) has been described using polyacrylamide gel isoelectric focusing electrophoresis of neuraminidase-treated EDTA plasma samples followed by electrophoretic blotting technique. In 435 individuals three different common patterns were observed, and these were controlled by two common alleles at a single locus. The results of typing family material confirmed autosomal codominant Mendelian inheritance. Two common alleles were designated FI*B and FI*A, and gene frequencies were estimated to be 0.8931 and 0.1069 for FI*B and FI*A, respectively. The distribution of phenotypes fitted the Hardy-Weinberg equilibrium. Linkage studies failed to show close linkage between factor I and the major histocompatibility complex.
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