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An experimenter cuts two pieces of tissue (tissue A and tissue B) from different regions of a late gastrula stage frog. When he allows these tissues to grow and develop in separate culture dishes, tissue A gives rise to muscle while tissue B gives rise to skin. He then repeats the experiment with the same tissues from a different embryo, but instead of placing them in separate dishes, he places them next to each other in the same dish. Tissue A tissue again gives rise to muscles, but tissue B tissue gives rise to tooth enamel. One can conclude from these results that, at the time tissue B was removed from the embryo, it was _____.
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