The zygote, and that is the cell ensuing from your fertilization of the oocyte by a spermatozoon, is totipotent. Several successive cell divisions make the morula, with 32–64 totipotent cells. After that stage, it develops into the blastocyst, which is made up of a hollow ball of cells. Peripheral cells (the trophoblast) of your blastocyst crank

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