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Fig. 3. Expression of Pax3 and Frek mRNAs by mesenchymal cells in
the myotome. (A) Cells expressing Pax3 mRNA (blue, arrowheads)
intermingle but do not overlap with desmin-positive fibers (brown) in the E4
myotome. At this stage, Pax3 is also transcribed in a DM-derived
intermediate domain located between myotome and forming dermis (see
Fig. 4 and corresponding text
for details). (B) Co-expression of PAX7 immunoreactivity (brown) and
Frek mRNA (blue) in mesenchymal cells within the myotome. D, dermis;
ID, intermediate domain; M, myotome; NT, neural tube. Scale bar: 30 µm in
A; 23 µm in B.
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