Gramicidin, also called gramicidin D, is a mix of ionophoricantibiotics, gramicidin A, B and C, which make up about 80%, 5%, and 15% of the mix, respectively. Each has 2 isoforms, so the mix has 6 different types of gramicidin molecules. They can be extracted from Brevibacillus brevis soil bacteria. Gramicidins are linear peptides with 15 amino acids.[2] This is in contrast to unrelated gramicidin S, which is a cyclic peptide.
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