Fig. 4

Pmar-Distal-less (Pmar-Dll) colorimetric in situ hybridization. Whole mount bright field images (Z-stack maximum intensity projection) overlaid with nuclear staining (Hoechst). Ch chelicera, Pp pedipalp, L1–4 leg 1–4; A/P anterior/posterior, dAEL days after egg laying. Scale bars: 500 µm