Immunocytochemistry staining as previously described (Halberg et al., 2015) .
Primary antibodies employed, mouse monoclonal anti-A5 Na + /K + vATPase asubunit (1:50), -43F discs-large 1 (1:500), -C594.9B Delta (1:200) all DSHB (Univ. of Iowa, IA, USA); rabbit polyclonal anti-Snakeskin and -Mesh (1:1000), Furuse Lab (Izumi et al., 2012; Yanagihashi et al., 2012) ; and rabbit polyclonal anti-Clc-A (1:50) (Cabrero et al., 2014) . Secondary antibodies, anti-rabbit Alexafluor 488 or 546 or anti-mouse Alexafluor 633 (Thermo Fisher Scientific)
(1:600). Tubules were also incubated in 500 ng/ml DAPI and Phalloidin TRITC (Sigma-Aldrich). Tissues were mounted on either Polysine slides (VWR International, Leuven) or glass bottomed dishes (MatTek Corporation, MA, USA) and analysed using Zeiss a LSM 880 confocal micro-system (Carl Zeiss Ltd., Cambridge UK). Confocal Z projection stacks used for cell counts, analyses, and presentation were opened in ImageJ (NIH, MA, USA) prior to transferal to Adobe Photoshop and Illustrator (CS6; CA, USA) for final presentation.