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Fig. 8. PDGFB activates the expression of connective tissue markers. PDGFB
or PBS beads were implanted into the dorsal regions of E5/HH26 chick wings and
the embryos were fixed 2 days later, at E7/HH30. Consecutive sections of the
PDGFB-treated wings (B,D) and of the corresponding control left
wings (A,C) were hybridized with probes for the muscle
connective tissue markers collagen I (A,B) and Tcf4 (C,D) and then
incubated with the MF20 antibody. (E) Transverse section of an E6 wing
showing the endogenous expression of Pdgfr
in muscle
connective tissue. Pdgfr
transcripts (blue) are detected in
the dorsal muscle mass (brown) in a future site of cleavage. (F)
PDGFB-treated wings were hybridized with the Pdgfr
probe.