[Leu5]-Enkephalin, amide is a δ opioid receptor agonist. Enkephalin, one of several naturally occurring morphinelike substances (endorphins) released from nerve endings of the central nervous system and the adrenal medulla.

Peldesine is an effective, competitive, reversible, and orally active inhibitor of purine nucleoside phosphorylase.

Histatin-8 is a part of the Histatin-3 central sequence and is known as hemagglutination-inhibiting peptide. Histatin-8 is a potent anti-fungal peptide. Histatin-8 shows antimicrobial activity against yeast strains. Histatin-8 can be used for oral thrush research.