blastem

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blastema
A mass of undifferentiated cells from which an organ or body part develops
{i} group of embryonic cells
A clump of undifferentiated cells or blasts, from which an organ or body part will develop, either during the normal growth of an embryo or in the regeneration of a lost body part
The structureless, protoplasmic tissue of the embryo; the primitive basis of an organ yet unformed, from which it grows
Blastem (Organanlage)
blastema