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"N"-acetyl-perosamine is found in the "O"-antigen of Gram-negative bacteria such as "Vibrio cholerae" "O"1, "E. coli" "O"157:H7 and "Caulobacter crescentus" CB15. The sugar is also found in perimycin, an antibiotic produced by the Gram-positive organism "Streptomyces coelicolor" var. aminophilus.