Retinoic acid is a potential dorsalising signal in the late embryonic chick hindbrain.

BMC Dev Biol · 2007 · PMC2266733 · PMID 18093305

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likely to be significantno p-value reported

As at the rhombic lip, Crabp1 is likely to be significant in transiently facilitating or terminating intracellular retinoic acid signalling as cells drop out of division.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.