Tageyyarcit (Trophoblast) d tibniqqin id yettgin tissi tuffiɣt i tuftagyirt (blastocyst) yessuddusen neɣ iy xeddmen učči i weqziz sin akin yettuɣal d amur meqqren seg tnefra, Dɣa tettnulfay-d deg talliyin timezwura n tadist akken id tga d tabniqt tamezwarut n tamagarda tabenniqt deg ubalal yemmurwen