LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Sperm cell. Computer artwork of a thermogram of a sperm cell. The head of the sperm cell (upper right) carries genetic material, which combines with an egg's genetic material during fertilisation. The tail beats to propel the sperm. Thermograms show variation in temperature through variation in colour. The scale runs from white (warmest) to dark blue (coldest).
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