The tetrapeptide structure shown below contains one amino acid that occurs twice. Which is it and in what positions? A) proline, 1st & 4th C) phenylalanine, 1s' & 4th B) cysteine, 2nd & 5th D) glycine, 2nd & 5th E) tyrosine, 1st & 4th но. NH2 HN. HN ÓH

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