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- W1910955449 abstract "M protein of group A streptococci was extracted by mild peptic digestion. Optimal amounts of type-specific M protein were released after 20 min of digestion with 0.02 mg of pepsin per ml at pH 5.8. Immunological analysis revealed that, unlike conventional HCl extracts, pepsin extracts lacked the surface C carbohydrate antigen and contained less non-type-specific, heat-stable cellular antigens; they also lacked detectable heat-labile T protein. Similar to HCl extracts, however, the pepsin-extracted M protein precipitated homologous-type M antisera and inhibited type-specific opsonization of homologous group A streptococci. Furthermore, the pepsin extract was capable of inducing type-specific opsonic M antibody in rabbits. This method may provide a useful initial step in the purification of M protein by reducing contaminating antigens." @default.
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- W1910955449 date "1974-05-01" @default.
- W1910955449 modified "2023-10-15" @default.
- W1910955449 title "Peptic Digestion of Streptococcal M Protein II. Extraction of M Antigen from Group A Streptococci With Pepsin" @default.
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- W1910955449 doi "https://doi.org/10.1128/iai.9.5.891-896.1974" @default.
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