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Two strains of L forms of group A streptococci were examined for group-specific polysaccharide and found to lack this substance. One of these was found to make a substance that had several properties in common with M protein. It is suggested that the absence of the cell wall polysaccharide is responsible for the lack of rigidity of the L form and that the L form of this species closely resembles protoplasts as prepared from other species.

EXAMINATION OF THE L FORMS OF GROUP A STREPTOCOCCI FOR THE GROUP-SPECIFIC POLYSACCHARIDE AND M PROTEIN