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Taken together, these results suggest that nuclear localization of FOXO4 may contribute to Leydig cell senescence and the downregulation of testosterone synthesis

\n Quick Answer Box: BPC-157 is a synthetic pentadic peptide derived from a protein found in gastric juice

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As a D-amino acid peptide, FOXO4-DRI is costly to synthesize, and a wrong amino acid at the binding site can sharply cut activity

Peptides with particularly vulnerable amino acid sequences, especially those containing arginine or lysine residues at cleavage-susceptible positions, may be broken down before absorption occurs