Fig. 1. Expression of MASH1 mRNA in a majority of SA progenitors within the developing adrenal gland. Cross-sections through the adrenal gland of E14.5 (A,B) and E16.5 (C,D) wild-type mice. Digoxigenin-labeled antisense RNA-probes for MASH1 mRNA (A,C) and TH mRNA (B,D) were employed. Sense controls did not result in any staining (not shown). sg, sympathetic suprarenal ganglion, where MASH1 mRNA expression at E16.5 is hardly detectable. Scale bars: 100 µm.