Longitudinal section through a Leishmania promastigote cell. Leishmania mexicana promastigote forms (WHO strain MNYC/BZ/62/M379) were grown in M199 culture medium. Cells were fixed with glutaraldehyde, post-fixed with osmium tetroxide, dehydrated in ethanol and embedded in epoxy resin. Thin sections (~90 nm) were viewed on a Philips Technai 12 transmission electron microscope operating at 80 kV. Magnification 13000X.
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