The Cellular Location of Antigens in Streptococci of Groups D, N and Q

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Abstract
The absence of Group-D antigen from the cell walls and protoplasts of Group-D streptococci leads to the conclusion that this antigen is located between the protoplast membrane and the cell wall. The Group-N antigen was likewise not present in cell walls of Group-N streptococci and probably has a similar location to the Group-D antigen. The Group-Q strains examined possessed the Group-D antigen in the cell contents although these strains did not physiologically correspond to any established Group-D species. The antigen upon which Group-Q is based is a cell-wall antigen.