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emm gene polymorphism tests of 17 M77, one M28, and one M73 GAS strains. Lanes 1, 6, 11, and 15 (A) and 1, 6, 11, and 14 (B), molecular weight marker (1-kbp DNA ladder; GIBCO); lane 2 (A), M28; lane 13 (B), M73. The remaining lanes show M77 strains.
