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Fig. 1. Somitic muscle progenitor specification occurs prior to induction of
Scx in the sclerotome. Whole-mount in situ hybridization at E10.5
(A-D) for Scx (A), Myf5 (B), Myod1 (C) and
Fgf4 (D). (E-L) Section in situ hybridization for Scx (E,I),
Myf5 (F,J), Myod1 (G,K) and Fgf4 (H, L), on
alternate sagittal (E-H) or frontal (I-L) sections, through somites of E10.5
embryos. Blue arrows indicate forelimb buds; purple arrows, hindlimb buds;
green arrows, branchial arches. Black arrows in E-H indicate onset of
expression.
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