F. smFISH detection of rab13 and kdr mRNA in cultured GFP-expressing endothelial cells extracted from 48 hpf Tg(kdrl:EGFP) rab13+/+ and rab13∆3'UTR /∆3'UTR zebrafish embryos. Arrows indicate orientation of RNA localisation; yellow dashed lines outline cell borders; red circles highlight smFISH spots; scale bars = 10 µm (F). 