Anatoxins are a group of neurotoxic alkaloids produced by a number of cyanobacterial genera including Anabaena, Oscillatoria and Aphanizomenon. The toxicity of these compounds (LD50)varies from 20 µg kg-1 (by weight, I.P. mouse) for anatoxin-a(S) to 200-250 µg kg-1 for anatoxin-a and homoanatoxin-a, making them more toxic than many microcystins.
