CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Implantation. Illustration showing a human blastocyst implanting into the uterine wall. A blastocyst is a hollow ball of cells formed by repeated cell division soon after an egg has been fertilised by a sperm cell. This is the first stage of embryonic development. If it successfully implants into the wall of the uterus, it can then develop into a foetus and placenta during pregnancy. Implantation occurs approximately five days after fertilisation.
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