(B-D) Time-lapse microscopy of Tg(fli1ep:MCP-GFPnls) tip (C) and stalk (B,D) cells displaying mosaic expression of Lyn-mCherry-24xMS2-rab13 3'UTR in ISV cells. Arrowheads indicate non-nuclear localisation of MCP-GFPnls; arrows indicate direction of ISV sprouting; yellow dashed lines outline ISV cell (B-D) borders 