Fig. 4. Expression of the Msx2–Noggin transgene and the endogenous Msx2 gene in wild-type and transgenic postnatal hair follicles. Sections of dorsal skin of newborn, P2 and P12 mice were probed with ³⁵S-labeled antisense riboprobes for Xenopus Noggin (A) and mouse Mxs2 (B). With the onset of detectable Noggin transgene expression at P2, expression of Msx2 is reduced in transgenic compared with wild-type hair follicles. Scale bar: 50 µm.