a mass of undifferentiated cells produced at an injury site in a regenerating animal such as the salamander

An undifferentiated mass of animal cells that later forms a structure or organ either embryologically if through regeneration, for example the head of a flatworm.

bisc333 a mass of undifferentiated cells from which an organ or body part develops

The structureless, protoplasmic tissue of the embryo; the primitive basis of an organ yet unformed, from which it grows.

a structure made up of rapidly dividing immature cells with the potential to become different tissues

a sprout; see anlage.