ACTH (4-11) is a peptide fragment of adrenocorticotropic hormone, a peptide hormone found in the brain that is involved in the biological stress response.

4-Methylumbelliferyl oleate is a fluorescent substrate for lipases (Ex/Em=320/450 nm), which can be cleaved by lipase and can be used to measure pancreatic inhibitory activity.

Met-Enkephalin-Arg-Phe is a naturally occurring heptapeptide with analgesic activity.