Ethylene thiourea is a pesticide used in fruit and vegetable production. Ethylene thiourea is also used as a novel contrast agent for MRI studies based on proton chemical exchange-dependent saturation transfer.

Gastrin-releasing peptide is a regulatory human peptide that elicits gastrin release and regulates gastric acid secretion and enteric motor function. The post-ganglionic fibers of the vagus nerve that innervate the G cells of the stomach release GRP, which stimulates the G cells to release gastrin.

Interleukin (IL)-6 Receptor is a peptide, derived from interleukin-6 receptor.