Microcystins are cyclic nonribosomal peptides produced by cyanobacteria (e.g., Microcystis aeruginosa and Planktothrix). They are cyanotoxins and can be very toxic for plants and animals including humans. Their hepatotoxicity may cause serious damage to the liver. Microcystins can strongly inhibit protein phosphatases type 1 (PP1) and 2A (PP2A), and are linked to pansteatitis.
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