Aspergillus parasiticus is a mold known to produce aflatoxins (a potent liver carcinogen), although strains of it that do not produce this carcinogen exist. It is closely related to but separable to (based on DNA sequencing and Amplified fragment length polymorphism fingerprinting) Aspergillus flavus. A. parasiticus produces aflatoxins B1, B2, G1 and G2, unlike A. flavus which only produces B1.