| gramicidin | Gramicidins are a group of polypeptide antibiotics derived from the bacterial species Bacillus brevis. (09 Oct 1997) |
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| Gramicidin A | <molecular biology> A linear peptide of alternate D and L amino acids that acts as a cation ionophore in lipid bilayer membranes. It is proposed that two molecules form a membrane spanning helix containing a pore lined with polar residues. (18 Nov 1997) |