taking into account , firstly , the morphogenetic movements that occur during gastrulation , i.e . the movement of epiblast cells towards the primitive streak where they ingress , and the migration of mesoblast cells along the basement membrane towards the periphery of the area pellucida , and secondly , the medial movement of the basement membrane , it is suggested that mesoblast cells picked up labelled compounds in the basement membrane of the graft and left these behind during their lateral migration .
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the migration
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cells