NICD overexpression causes expansion of proximal mesenchymal and epidermal compartments. (A,B) Whole-mount in situ hybridization of hs:Gal4; UAS:NICD and UAS:NICD fins heatshocked repeatedly from 0 hpa to 6 dpa with the indicated markers reveals massive proximal expansion of proximal, but not distal, blastemal and epidermal domains upon NICD overexpression. mps1=6/6 fins; ilf2=6/6; and1=9/11; lef1=7/7; wnt10a and inhbaa=4/5; wnt5b and pea3=5/6. Arrowheads indicate the amputation plane. Scale bars: whole mounts, 200 μm; sections, 100 μm.