s-Enterobacteria Phage T4 Decapeptide-1 SP Trifluoroacetate is the trifluoroacetate salt of a single chain peptide produced synthetically to be identical to a portion of the protein, Endonuclease V, which is found in Enterobacteria Phage T4. It contains 10 amino acids consisting of alanine, glycine, isoleucine, lysine, phenylalanine, tryptophan, and tyrosine. The parent protein contains a maximum of 138 amino acids which may contain disulfide bonds and/or glycosylations.