Figure 4

Expression pattern of the Cs-Scr-1 and Cs-Scr-2 genes. Expression of the Cs-Scr-1 gene (A-C) and the Cs-Scr-2 gene (D-F). At the limb bud stage Scr-1 is more or less homogenously expressed in L2, L3 and L4 (arrow in A). At later stages there is expression in rings in the legs of L3 and L4 (B) and later also weak expression in the legs of L2 (C). Scr-2 expression starts as small spots in the ventral ectoderm of L2, L3 and L4 (arrowheads in D) that persist during further development (E,F). Later there is also Scr-2 expression in the legs of L3 and L4, but in contrast to Scr1 we never observed expression in the legs of L2 (F). Ch: cheliceres, Pp: pedipalps, L1-L4: walking leg 1–4.