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We designed a new toxic bioassay using the green paramecia Paramecium bursaria as testing organism. P. bursaria is a unicellular organism that occurs widely in rivers and ponds. Since P. bursaria uses metabolites of endosymbiotic green algae in the cytoplasm as a nutritive source, culturing P. bursaria is much easier than culturing mammalian cells. The use of P. bursaria will thus make quicker and...