Blastocyst embryo. Conceptual computer artwork of an embryo at the blastocyst stage above a grid. This ball of cells forms a few days after the fertilization of an egg. There are two types of cell (blastomere) here: stem cells (yellow) are pluripotent, capable of giving rise to most tissues. Trophoblast cells (green) embed the blastocyst into the wall of the uterus.
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