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Fig. 10. Transplanted trunk mesoderm forms scattered myocytes and myotubes, as shown
in sections from stage 28-29 embryos. (A) An ectopic aggregate (bottom of
figure) containing non-aligned myotubes, identified by their shape and
synthesis of MyHC (F59-positive, blue), with individual MyHC-positive cells
dispersed deep to the dorsal quadrant of the eye. Some MyHC-positive cells are
adjacent to the pigmented epithelium of the eye (right side), which normally
is populated by connective tissues (e.g. sclera) formed by periocular neural
crest cells. (B,C) Scattered myoytubes in the supra-orbital band; both cases
shown are from segmental plate grafts. (D) A multinucleated myotube (MyHC,
magenta) adjacent to the eye; the pigmented epithelium is visible on the
right. (E) A triple-stained section from a lateral half somite recipient,
showing graft-derived endothelial cells (QH1, brown), myocytes (MyHC, magenta)
and quail nuclei (QCPN, black). Although invasive movements of grafted
angioblasts have been reported, comparable behavior by myoblasts is novel. No
double-labeled myoendothelial cells were found.
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