cn1 bw1 sp1 zip1/CyO (BDSC 4199),
P{FRT(whs)}G13 zip2/CyO (BDSC 8739),
P{lacZ.w+}276, y1 sc* v1 sev21; P{TRiP.GL00623}attP40 (BDSC 37480), y1 sc* v1 sev21; P{TRiP.HMS01618}attP2 (BDSC 65947),
SqhAX3-GFP (BDSC 57144), UAS-Bsk-DN (BDSC 6409), vg-GAL4 (BDSC 8222), GMR-GAL4 (BDSC 8121), ptc-GAL4 (BDSC 2017), en-GAL4 (BDSC 30564), ap-GAL4 (BDSC 56807), dpp-GAL4 (BDSC 1553), and C96-GAL4 (BDSC 43343) stocks were obtained from Bloomington stock center. All crosses were performed at 25 °C. The combination lines vg-GAL4/UAS-GFP-zip and UAS-Notch-DN/C96-GAL4 were made with the help of appropriate genetic crosses.