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Fig. 1. Distribution of type I BMPRs in the lumbar region of E11.5 mouse spinal
cord. (A) BmprIa is expressed throughout the VZ and is
absent from the mantle layer, outlined in A and B. (B,C)
BmprIb is expressed specifically in the dorsal and intermediate VZ,
and in the dorsal-most neurons in the mantle layer (open arrowhead, C). The
yellow box in B is shown at higher magnification in C. (D)
BmprIb is expressed in an overlapping population of commissural
progenitor cells and neurons with that labeled by antibodies against Math1
(open arrowheads, C,D). Scale bars: in A, 50 µm for A,B; in C, 25 µm for
C,D.