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• In one case, indeed, what appear to be flagella and, as such, organelles of the protozoon cell, prove to be, rather, distinct organisms that have established a symbiotic relationship with it. The protozoon Myxotricha paradoxa is solidly covered with what were always regarded as flagella, fine hairs that by their whiplike action move it through the water, until it was discovered that each hair was in fact a distinct bacterium […]