WIM VAN EGMOND / SCIENCE PHOTO LIBRARY WIM VAN EGMOND / SCIENCE PHOTO LIBRARY
Differential interference contrast (DIC) light micrograph of Trachelomonas volvocina (larger, oval) and Trachelomonas hispida (smaller, spherical) protists. These are flagellated algae with a red 'eye spot' or stigma used for orienting itself towards a light source. Magnification: x400 when printed 10 centimetres high.
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