A mycotoxin (from Greek μύκης (mykes, mukos) "fungus" and Latin (toxicum) "poison")'s a toxic secondary metabolite produced by an organism of the fungus kingdom, including mushrooms, molds, and yeasts. The term 'mycotoxin''s usually reserved for the relatively small (MW ~700), toxic chemical products formed as secondary metabolites by fungi that readily colonize crops in the field or after harvest. Where conditions are right, fungi proliferate into colonies and mycotoxi… (More on Mycotoxins)