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When endogenous peptides are supported by exogenous peptides, the organism obtains more resources to fulfill specific functions

Diminished CFTR expression has been observed in spermatozoa from men with various sperm quality abnormalities (teratozoospermia, asthenozoospermia and oligozoospermia), and correlates positively with sperm motility and morphology

Alvarez-Buylla A, Garcia-Verdugo JM

10.1111/acel.12073 33 NguyenD.HsuJ

Pickart was studying liver tissue regeneration and noticed that a small peptide fraction isolated from human plasma significantly accelerated repair in older liver cells, restoring their behavior to something closer to younger cells