Embryos were injected with 40-kDa dextran-FITC at 48 hpf, and imaged at 72, 84, and 96 hpf. Control wild-type embryos displayed renal clearance by diminution of the net fluorescent signal intensity over time, as well as dextran-FITC internalization throughout the PCT (white arrows) during its progressive morphogenesis. Double prkcι/ζ morphants displayed severe fluid accumulation, notably pericardial edema that remained strongly positive for the dextran-FITC conjugate label, and the PCT was not labeled by dextran endocytosis (Left panels, lateral views; right panels, dorsal views, with exception of bottom right which shows a lateral/dorsal angled view).