Researchers Masaki Kita and Daisuke Uemura have isolated the peptides in platypus venom that induces pain in humans. The peptides induce calcium ions to rush into cells, and as we all know, calcium ions bring the pain (or perhaps more accurately, lead to long-term potentiation (LTP), which is basically…. pain).
Kita, Uemura, et al’s paper: Duck-Billed Platypus Venom Peptides Induce Ca2+ Influx in Neuroblastoma Cells
I know, it’s Saturday. But that’s just typical procrastination on my part.