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  1. Electron Micrograph: Leishmania braziliensis promastigotes

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    Description: This is an electron microscopic (EM) image of Leishmania braziliensis promastigotes grown in cell culture. Note the dense kinetoplasts in the cytoplasm of these flagellated forms. Promastigotes are not found in human tissue; this stage occurs in the mid-gut of the sand fly (genera Phlebotomus and Lutzomyia) intermediate hosts. Promastigotes are elongate, slender and measure about 10-12 µm in length. They have a large central nucleus and a kinetoplast located near the anterior end. A flagellum arises at the anterior end, that may be longer than the rest of the promastigote.
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  2. Electron Micrograph: Zika virus

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    Description: This is a transmission electron microscopic (TEM) image of Zika virus, grown in LLC-MK2 culture cells, which is a member of the family Flaviviridae. Virus particles are 40 nm in diameter, with an outer envelope, and an inner dense core. Also note the smooth membrane vesicles, which are known to be the replication complex for this virus.
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