Stock Video - Rat embryo heart. Close-up light microscopy footage of the beating heart of a 10.5-day-old rat embryo. An embryo forms in stages following the fertilisation of a female sex cell (ovum) by a male sex cell (sperm). Gestation (the period of development in the uterus) in rats takes 22 days.

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CLOUDS HILL IMAGING LTD/SCIENCE PHOTO LIBRARY