Fig. 3. The distribution of complete floor plate (with medial and lateral components) (red) or lateral floor-plate cells only (blue) induced in the lateral neural tube of E5 to E7 chick embryos mapped as a function of the somitic stage (ss) of the chick hosts (x-axis) and of the quail donors (y-axis) of inducer tissues [notochord (No; closed circles) or floor plate (FP; open circles)] at the time of the graft. For SHH-producing cell grafts (squares) only chick host age is considered. The number of cases for each experimental series is indicated. It appears that MFP induction can occur only if the chick host is younger than 15 ss when the stage of the quail donor is between 10 and 25 ss.

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