Table 1. Primary antibodies used in this study.

Name of primary antibody	Immunogen	Manufacturer, Cat. No., Species raised in, Mono-/Polyclonal	Antibody dilution
Anti-BRPlast200	Last 200 amino acids of large D. melanogaster Bruchpilot isoforms (e.g. amino acids 1540–1740 of isoform D, protein accession number: NP_724796)	Prof. Dr. Sigrist, rabbit, polyclonal (Ullrich et al., 2015)	Western blot: 1:6,000 Immuno-histochemistry: 1:500
Anti-BRPD2	D. melanogaster Bruchpilot domain D2 (amino acids 268–617)	Prof. Dr. Sigrist, rabbit, polyclonal (Fouquet et al., 2009)	Western blot: 1:20,000
Anti-α-Tubulin mouse mAb (DM1A)	Native chicken brain microtubules	Calbiochem, Sandhausen, Germany, #CP06, RRID: AB_212802, mouse, monoclonal	Western blot: 1:3,000
Anti-SYNORF1	D. melanogaster synapsin Glutathione S-transferase fusion protein, epitope: 341 LFGGMEVCGL 350	DSHB, Iowa City, IA, USA, Anti-SYNORF1, #3C11, RRID: AB_2313867, mouse, monoclonal	Western blot: 1:1,500 Immuno-histochemistry: 1:100