The Presence of Type 12 M-Protein Antigen in Group G Streptococci Maxted, W. R. and Potter, Elizabeth V.,, 49, 119-125 (1967), doi = https://doi.org/10.1099/00221287-49-1-119, publicationName = Microbiology Society, issn = 1350-0872, abstract= SUMMARY Three strains of group G streptococci isolated from a community in which glomerulonephritis is common were found to have an M-protein antigen indistinguishable from the type 12 M-protein of group A, type 12, streptococci., language=, type=