Differential interference contrast (DIC) light micrograph of a Phacus longicauda flattened Euglenophyte, or Euglenoid, protozoan. It propels itself with a whip-like flagellum or undulipodum. The red stigma helps it to orientate towards a light source. The white disc in the centre is a paramylon body, a carbohydrate energy reserve. Left of it lies the nucleus. Green chloroplasts enable photosynthesis. Magnification: x630 when printed 10 centimetres wide.
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