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Twenty-four strains of chromogenic microorganisms were tested for their effects on five strains of small amoebae. Of the 24 strains only Serratia marcescens, Pseudomonas aeruginosa, and Chromobacterium violaceum and their pigments, prodigiosin, pyocyanine, and violacein, respectively, were found to be toxic to the amoebae.
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Groscop et al. (1964) studied this question.
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