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Fig. 2. Histochemical staining for ßgal+ in wholemounts of
WlacZ/+ mice. (A) At E9.5, ßgal+ cells
(arrows) are present in the cervical region of the embryo on the dorsal
midline; no ßgal+ cells were observed elsewhere in the
ectoderm. (B) Low-power view of an E10.5 embryo showing strong
ßgal+ cells along the dorsal midline (arrows), and lateral to
it under the ectoderm. (C) High-power view of the boxed area in B, showing
ßgal+ cells on the dorsal midline and emanating from it
(arrows). (D) Montage of images from the trunk of an E11 embryo, showing
ßgal+ cells distributed extensively under the ectoderm. dm,
dorsal midline. Scale bars: 0.5 mm.