[Met5]-Enkephalin, amide is an agonist for δ opioid receptors as well as putative ζ (zeta) opioid receptors.Met-enkephalin circulates in several forms, some of which may be derived from proteins other than proenkephalin A, and plasma levels of both free native, and peptidase-derivable Met-enkephalin are modulated physiologically.

BCI-137 是 Argonaute 2 配体。它通过靶向 MicroRNA 结合域发挥作用。

Erythrivarone A 是从 Erythrina variegate 的茎皮中分离得到的异黄酮。