Abstract:High Association Between Properdin Factors BfF1and HLA-B 18 in a Portuguese Family Summary. The H L A and the Bf systems were studied as part of a family investigation carried out in Portugal. In four generations the rare phenotype BfF1 could be determined four times and the BfF1S phenotype six times, HLA-B18 being simultaneously positive in all cases. Since the frequencies of the individual factors F1 and B18 do not differ essentially from those obtained in Central Europe and no inbreeding situation was prese… Show more
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