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Fig. 4 Adaxial cell behaviors are dependent on Hedgehog signaling. (A) Anterior presomitic and posterior somitic mesoderm in a 10-somite yot-/- embryo. (B) More anterior somites of the same embryo. Anterior is up in both panels. Adaxial cells (arrows) in the presomitic mesoderm of yot mutants are distinguishable by their columnar appearance (A), but fail to accumulate apical actin or to undergo any intercalation or broadening behaviors as somites begin to form (B), and quickly become indistinguishable from other somitic cells (arrowheads).
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Reprinted from Developmental Biology, 309(2), Daggett, D.F., Domingo, C.R., Currie, P.D., and Amacher, S.L., Control of morphogenetic cell movements in the early zebrafish myotome, 169-179, Copyright (2007) with permission from Elsevier. Full text @ Dev. Biol.