Larval and adult immunostaining were performed as previously described (Certel and Thor 2004 (link); Petersen and Stowers 2011 (link)). Primary antibodies and dilution factors: The SYN (3C11) mAb 1:25 developed by E. Buchner (Klagges et al. 1996 (link)) was obtained from the Developmental Studies Hybridoma Bank, created by the NICHD of the NIH and maintained at The University of Iowa, Department of Biology, Iowa City, IA 52242. Mouse anti-vGlut (Banerjee 2021 (link)) 1:10; Rabbit anti-Syt (Littleton et al. 1993 (link)) 1:1,000; Mouse anti-mCherry (Biorbyt orb256058) 1:200; Rabbit anti-mCherry (Abcam ab213511) 1:500, Rabbit Abfinity anti-GFP (Thermo-Fisher) 1:400, Rabbit anti-HA (Cell Signaling C29F4) 1:500, and Rat anti-FLAG (Novus NBP1-06712) 1:200. Secondary antibodies and dilution factors: Donkey anti-Rat Alexa 488 (Jackson Immunoresearch 712-546-153) 1:400, Donkey anti-Mouse Alexa 488 (Jackson Immunoresearch 715-545-151) 1:400, Goat anti-Rabbit Alexa 488 (Thermo-Fisher A32731) 1:200, Donkey anti-Mouse JF549 (Novus NBP1-75119JF549) 1:200, Goat anti-Rabbit JF549 (Novus NBP1-72732JF549) 1:200, Goat anti-Rabbit JF646 (NBP1-72732JF646). Larval muscles were stained with Phalloidin 405 (Biotium CF405M).
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