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Long and spindle-shaped, this Leishmania promastigote parasite shows the single-celled form that travels inside sand flies. A raised nucleus swells near the middle, the small kinetoplast sits at the front, and oval organelles are sculpted across the tapered body. A whip-like flagellum trails from the forward end while a fine tip extends from the back. It is a clear and slightly sinister teaching model for a microbiology or tropical disease lesson, a biology classroom or a collection of microscopic life on display.

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