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Microcystins (MCs) are cyanobacterial toxins which place the public at risk via exposure to MC contaminated water, food or algal food supplements. Subsequent to the fatal intravenous exposure of dialysis patients in Caruaru, Brazil, several techniques (LC–MS, GC–MS and ELISA) were adapted to detect MCs in human serum. As patients chronically exposed to low concentrations of MCs also present with very...