A Trypanosoma brucei cell divides in the bloodstream of its human host. (The two flagellae on the left show that this particular protist was caught in the middle of mitosis.) If untreated, the host will develop trypanosomiasis -- West African sleeping sickness.
SEM by the Gull Lab, Sir William Dunn School of Pathology, courtesy of the wonderful Wellcome Images collection.
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