R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY R. MAISONNEUVE, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Sperm sample. A technician injects a sample of donated human sperm into a test tube to prepare it for freezing in a sperm bank. Donor sperm is used to help infertile couples have babies by in vitro fertilisation, where the mother's eggs are fertilised in a laboratory. The donor sperm is mixed with various substances to prevent cell damage during freezing.
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