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Clonal differentiation in the mouse embryo

A 3D reconstruction of an early mouse blastocyst. The blastocyst is formed three- four days post fertilization in the mouse and it is at this stage that the cells start to differentiate. Two types of cells form, those that will be part of the inner cell mass and ultimately form the fetus and the others become part of the trophectoderm and will act as the supporting cells forming structures like th…