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Figure Caption
Fig. 3-S1
MEK inhibitor does not cause an expansion of id1 expression into the PSM.
Embryos were treated with a MEK inhibitor at the 12-somite stage and fixed and analyzed for id1 expression six hours later. The expression of id1, which is a direct BMP target gene, does not expand into the PSM after MEK inhibition (B, arrow, compared to A).
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