agents differentially inherited at each cell division that make cells different from each other (12)
cells isolated from different tissue layers separate from each other when cultured together, cell surface must contain determinants that mediate this process (4, 8)
different parts must grow at different rates (9)
driven by individual cell behaviour (10, 9)
each cell of the two-cell embryo carries a different potential cell fate, one for the left and one for the right half of the embryo (8, 4, 5, 3)
plant cells are connected to their neighbours (13)
the process common to all animal embryos which generates the three tissue layers (12)
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