SYNOPSIS Crithidia deanei from the reduviid hemipteron, Zelus leucogrammus , unlike most lower trypanosomatids cultivated in defined medium, required only 2 amino acids, methionine and tyrosine; only 4 vitamins, folic acid, thiamine, biotin, and nicotinamide; and neither hemin nor a purine source. Electron microscopy reveals an endosymbiont, probably bacterial, which presumably provides the other basic trypanosomatid essential nutrients.
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MUNDIM et al. (1974) studied this question.
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