a, Using the hiPSC line BJFF.6, a 30 hour exposure during the first stage of differentiation was also required for the primitive streak phenotype. b, AIM transcription factors PAX2, GATA3, LHX1, and HOXB7 were induced with very high efficiency by day 3. c, The hiPSC-derived AIM exhibited efficient formation of nephric duct spheroids in 96-well low attachment plates, which underwent similar molecular and morphological development compared to hESCs as shown in Figure 1. d, Nephric duct spheroids efficiently grew into branched UB organoids. e-f, hiPSC-derived UB organoids exhibited tip-stalk patterning and spontaneously formed differentiated AQP2-positive principal cells. Scale bars, 50 μm (a-d) and 100 μm (e-f).