Antibodies used for immunostaining included: mouse anti-nc82 (1:50, Developmental Studies Hybridoma Bank), rat-anti-Chinmo (1:500; Wu et al., 2012 (link)), rabbit anti-Br-Z3 (1:250; this study), rabbit anti-GFP (1:1000; Invitrogen), chicken anti-GFP (1:500; Rockland Immunochemicals), rabbit anti-dsRed (1:500; Clontech), mouse anti-mCherry (1:500; Clontech), rabbit anti-β-gal (1:500; MP Biomedicals), chicken anti-β-gal (1:500; Abcam). Most primary antibodies were preabsorbed against fixed embryos. Secondary goat antibodies were conjugated to Alexa Fluor 488, 568 or 633 (Molecular Probes). Slides were mounted in Vectashield (Vector Labs) or dehydrated through an ethanol series and mounted in DPX. Images were collected on a Leica SP5 (Light Microscopy Imaging Center, Indiana University). Confocal stacks were merged using Leica LSM software. Samples that were directly compared were prepared under identical conditions and imaged in parallel.
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