Ribotyping, a molecular method based on the analysis of restriction fragment length polymorphisms (RFLPs) of ribosomal RNA genes, has been widely adopted to distinguish a variety of bacteria (1-5). For the past five years ATCC has been using the RiboPrinter® Microbial Characterization system (Qualicon Inc., Wilmington, DE) as a primary method for characterizing strains during the quality contro...

C3 exhibits two common allotypic variants that may be separated by gel electrophoresis and are called C3 fast (C3 F) and C3 slow (C3 S) . C3 F, the less common variant, occurs at appreciable frequencies only in Caucasoid populations (gene frequency = 0.20) . An increased prevalence of the C3 F allele has been reported in patients with partial lipodystrophy, IgA nephropathy, and Indian childhood...

C3 exhibits two common allotypic variants that may be separated by gel electrophoresis and are called C3 fast (C3 F) and C3 slow (C3 S). C3 F, the less common variant, occurs at appreciable frequencies only in Caucasoid populations (gene frequency = 0.20). An increased prevalence of the C3 F allele has been reported in patients with partial lipodystrophy, IgA nephropathy, and Indian childhood h...