CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Implantation. Illustration showing the position of a woman's uterus (womb). At upper right is blastocyst embryo (a hollow sphere of cells) implanted in the wall of the uterus. The blastocyst implants itself in the uterine wall approximately five days after fertilization.
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