SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Blood vessels in the ovary of a female frog, coloured scanning electron micrograph (SEM). Frogs produce hundreds of eggs, which are expelled and fertilised in the water. This is a resin cast: the blood vessels were filled with a liquid resin, which then set hard. The surrounding tissues were then removed chemically, leaving the cast. Magnification: x60 when printed 10cm wide.
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