More then 5000 antimicrobial peptides (AMPs) have been discovered to date, the first one (gramicidin) back in 1939. This review article provides a good overvie

More then 5000 antimicrobial peptides (AMPs) have been discovered to date, the first one (gramicidin) back in 1939. This review article provides a good overview of different AMPs and the history of their discovery: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873676/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873676/