Immunohistochemical Analysis of Pupal Wings

Pupal wings were fixed in 3.7% formaldehyde (Sigma-Aldrich) at 4°C overnight. Wing imaginal discs were fixed in 3.7% formaldehyde at room temperature (RT) for 20 minutes. All immunostaining and in situ hybridizations were performed as described previously [7 (link),9 (link)]. The primary antibodies used are as follows: mouse anti-DLG1, rat anti-DE-Cadherin and mouse anti-GFP (for immunohistochemistry; all at 1:50) were obtained from Developmental Studies Hybridoma Bank, rabbit anti-phospho-SMAD1/5 (1: 200 for IF, 1:2000 for Western blotting) from Cell Signaling Technology (CST), rabbit anti-Rab5 (1:600) and rabbit anti-RFP (1:5000 for Western blotting) from Abcam, mouse anti-RFP (1:5000 for Western blotting) from Chromotek, mouse anti-GFP (1: 5000 for Western blotting) from Millipore, mouse anti-β-tubulin (1:5000) from Sigma-Aldrich, rabbit anti-MYC (1:500), goat anti-Scrib (1:100), rabbit anti-aPKC (1:100) and mouse anti-LGL (1:200) from Santa Cruz Biotechnology, and rabbit anti-Scrib (1:2000) from C. Doe. Secondary antibodies were as follows: goat anti-mouse IgG Alexa 488, goat anti-mouse IgG Alexa 568, goat anti-mouse IgG Alexa 647, goat anti-rabbit IgG Alexa 568, goat anti-rabbit IgG Alexa 647, goat anti-rat IgG Alexa 488 and goat anti-mouse IgG Cy5, all from Molecular Probes (1:200). GFP-booster (1:200, ChromoTek) was used to enhance the YFP signal in Fig 3F and S2C Fig.