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They are not illegal to buy or own, but they are not approved for human use, so are not subject to the quality controls that govern pharmaceutical manufacturing

For instance, unprocessed NFKB2 (p100) may be induced by acute TCR signaling and could function as an inhibitor of RelB, thereby limiting Treg expansion until inflammatory, TNF receptor-mediated signaling activates the processing of p100 into p52

A study published in PLOS ONE demonstrated that topical application of a tetravalent peptide resolved eczema in mouse models within 14 days, restoring normal epidermal morphology

The 5th edition of Fundamentals of Clinical Trials by Friedman et al