Xenin is a 25 amino acid peptide that has been identified in human gastric mucosa in the search for a counterpart to the amphibian octapeptide xenopsin.

Tuberostemonine D, an alkaloid obtained, can be obtained from the root of Stemona tuberosa.

菜豆素是一种来自烟草毛状体的尿黑酸葡萄糖苷，有助于植物抵抗鳞翅目食草动物。