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Size variation in the scl gene. The complete scl gene and putative promoter region were amplified by PCR and analyzed by agarose gel electrophoresis. All 50 strains tested yielded a single PCR product, and representative examples of the size variants identified are shown. (A) Size variation in the scl gene in different M-type GAS strains. (B) scl gene size variation among strains of certain M types, including M12, M28, and M56.
