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Organization of the egc locus in reference and atypical strains. A900322 (GenBank accession number AFP285760) is the egc reference strain. A900624 harbors two new enterotoxin genes, selu2 and selv. LY19991287, A950227, LY19991222, A980341, and A940440 have an insertion sequence (Rve-like 1-transposase 8 or Rve-like 2-IstB-like). These sequences are shown schematically below the genes into which they are inserted.
