Replacement of phenylalanine in gramicidin S by other amino acids.
D000596:Amino Acids; D055598:Chemical Phenomena; D002621:Chemistry; D006096:Gramicidin / Q000138:chemical synthesis*; D010649:Phenylalanine; D014443:Tyrosine
D000596:Amino Acids; D006096:Gramicidin; D014443:Tyrosine; D010649:Phenylalanine