Calycanthine, the principal alkaloid of the order Calycanthaceae, has been isolated from a species of the genus Psychotria, and is a central nervous system toxin, causing convulsions.

α-Synuclein (34-45) (human) is the 34-45 fragment of α-Synuclein. α-Synuclein is an abundant neuronal protein that is highly abundant in presynaptic nerve terminals. α-Synuclein is a Parkinson's disease (PD) biomarker.

Competence-Stimulating Peptide-12261, a sixteen peptide, is a fragment of competence-stimulating peptide.