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J Nutr 136:1660S5S, PMID: 16702336 Peterson JD, Herzenberg LA, Vasquez K, Waltenbaugh C (1998) Glutathione levels in antigen-presenting cells modulate Th1 versus Th2 response patterns

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The peptide retains activity in human gastric juice for more than 24 hours, tolerates pH from 1 to 11, and resists multiple proteolytic enzymes, properties that derive from the high proline content (four of fifteen residues) and the absence of cleavage-prone motifs