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Xia et al., 2020

The pharmacokinetic properties of a peptide are optimized using chemical modifications such as changing l-amino acids with d-amino acids, cyclization, conjugation (e.g., acylation, pegylation, glycosylation), amide bond protection (e.g., N-methyl groups), and incorporation of altered or unnatural amino acids (e.g., tert-butyl group on serin)

Research overview About BPC-157 BPC-157 is a synthetic pentadecapeptide a fifteen-amino-acid chain whose sequence corresponds to a partial fragment of a protein originally identified in gastric juice and described in the scientific literature

Research interest in the AngIV/AT4 receptor system was further encouraged by the finding that AT1 and AT2 receptor antagonists failed to block learning and memory tasks in animal models [70]