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Fig. 2 Transverse sections of regenerating fins showing the normal expression patterns of shh (A), ptc1 (B) in two adjacent rays; bmp2b (C) in one ray at 4 dpa; ptc1 expression 2 days after injection of N-shh (D) or bmp2b (E) constructs. Note the ectopic expression of ptc1 in mesenchyme and basal epithelial cells separating the branching rays (indicated by the brackets) after ectopic expression of N-shh (D) but not bmp2b (E). Arrows in A-C indicate shh, ptc1, and bmp2b expression in basal epithelial cells. Arrowheads in B and C indicate ptc1 and bmp2b expression in scleroblasts. (Bar = 50 μm.)
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Full text @ Proc. Natl. Acad. Sci. USA