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Fig. 1. Xenopus hypaxial muscles and lbx1 expression.
Stage 37 (A) and 45 (B) tadpoles were stained with the 12/101
antibody. A is a lateral view, while B is a ventral view with anterior to the
left. The hypaxial muscles consist of the rectus abdominus, rectus cervicus
and geniohyoideus. (C-H) Expression of lbx1 from stage 17 to 42.
(C) Neural expression precedes myoblast expression (stage 17, dorsal
view). (D) Early myoblast expression can be seen at stage 26
(arrowhead). (E,F) Myoblast expression expands posteriorly and
ventrally as development procedes. (G) At stage 37,
lbx1-positive cells can be seen migrating around the hyoid (arrow).
(H) By stage 42, very few lbx1-positive myoblasts are seen in
the ventral body wall region (arrowheads).
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