Glycyl-L-valine is a dipeptide composed of glycine and valine. It is an incomplete breakdown product of protein digestion or protein catabolism.

Lofendazam (Bu 1014) is a benzodiazepine derivative that has sedative and anxiolytic effects.

Bursin is a peptide that can be isolated from the bursa of Fabricius of chicken. Bursin induces the phenotypic differentiation of mammalian and avian B precursor cells. Bursin also increases cyclic guanosine monophosphate in cells of the human B-cell line Daudi, its derivatives are able to protect against infection by amplifying the immune response induced by H9N2.