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The trophoblasts are the cells located on the periphery of the embryo. They stick to the uterine lining to allow it to implant and gradually invade it in order to draw all the nutrients it needs to develop. The trophoblast transforms little by little into placenta. The trophoblast sample makes it possible to perform a karyotype (characteristic arrangement of the chromosomes of a cell) whose results are known in a few days. Performed by natural routes and under ultrasound control at two months of amenorrhea, it does not require hospitalization.