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Histone toxicity to promastigotes. Promastigotes were incubated with purified histone for 30 min and stained by the live/dead method. Dead promastigotes stained in yellow/orange and live promastigotes in green. Differential interference contrast image merged with the fluorescence staining of the same cells. (*) The beating of a live promastigote flagellum. Bars, 20 μm.
