Neuropeptide AF (cattle), an amidated octadecapeptide, is RFamide neuropeptide. Neuropeptide AF (cattle) acts as a ligand of Mas-related gene receptor A4 (MrgprA4) (Mas-related G-protein-coupled Receptor (MRGPR)) (EC50 of ~60 nM) and MrgprC11 (EC50 of ~300 nM). Neuropeptide AF (cattle) also activate to the G protein-coupled receptors NPFF1 (Neuropeptide Y Receptor) (EC50 of ~25-325 nM) and NPFF2 (EC50 of ~1-5 nM). Neuropeptide AF (cattle) shows anti-opiate and related pain modulation effects.

UNC 0646 is a potent and selective inhibitor of the homologous protein lysine methyltransferases, G9a and GLP (IC50s: 6 nM/15 nM for G9a/GLP).

Viscidulin III is present in Scutellaria baicalensis and acts as an α-glucosidase inhibitor.