H. rab13 PI plotted against respective kdr PI. The slope of the coloured lines represents the average rab13/kdr PI ratio; the dashed grey line represents a 1:1 ratio (n≥8 cells). : +/+, +/∆ and ∆/∆ represent Tg(kdrl:EGFP) rab13+/+, rab13+/∆3'UTR and rab13∆3'UTR /∆3'UTR embryos, respectively 