Larval filet preparation and staining was essentially performed as described (Han et al., 2012 (link)). The following antibodies were used: rabbit anti-phospho-Ret (1:50, Cell Signaling Technology, Danvers, MA), mouse anti-GFP (1:100, Roche Diagnostics, Mannheim, Germany), mouse anti-mys (1:200, Developmental Studies Hybridoma Bank, (DSHB), Iowa City, IO), mouse anti-mew (1:50, DSHB). Secondary DyLight or Alexa conjugated donkey antibodies were from Jackson ImmunoResearch (Westgrove, PA) and were used at 1:400–1:1000.
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