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Comparative marker gene expression analysis in mouse and squamate embryos. Genitalia markers Isl1 (a-d), Runx1 (e,f), Gata2 (g-j), Eya (k,l), Tbx5 (m-p) and Dkk2 (q,r). Gata2 only becomes visibly expressed at later stages of house snake hemipenis development (j, inset). Limb markers Lhx9 (s-v), Tbx18 (w,x) and Lmx1b (y-zi). All gene expression assessed in at least n=3. Scale bar, 200 μm. lb: limb; cl: cloaca; gt: genital tubercle; hp: hemipenis.
