Primary antibodies: rabbit-anti-phospho-Smad1/5 (41D10, Cell Signaling, #9516; 1:200), mouse-anti-Wg (4D4, DSHB, University of Iowa, RRID:AB_528512; total staining: 1:120, extracellular staining: 1:120), mouse-anti-Ptc (DSHB, University of Iowa, RRID:AB_528441; total staining: 1:40), rat-anti-HA (3F10, Roche, 11867423001, RRID:AB_390914; total staining: 1:300, extracellular staining: 1:20), rat-anti-Ollas (L2, Novus Biologicals, NBP1-06713, RRID:AB_1968650; total staining: 1:300, extracellular staining: 1:20), mouse-anti-HS (F69-3G10, amsbio; 1:100).
The following secondary antibodies were used at 1:500 dilutions in this study. Goat anti-rabbit IgG (H+L) Alexa Fluor 488 (A11008 Thermo Fischer), goat anti-rabbit IgG (H+L) Alexa Fluor 568 (A11011 Thermo Fischer), goat anti-rabbit IgG (H+L) Alexa Fluor 680 (A21109 Thermo Fischer), goat anti-rat IgG (H+L) Alexa Fluor 568 (A11077 Thermo Fischer), goat anti-mouse IgG (H+L) Alexa Fluor 568 (A11004 Thermo Fischer), goat anti-rat IgG Fc 488 (ab97089 abcam), goat anti-mouse IgG Fc Alexa Fluor 680 (115625071 Jackson Immuno Research).
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