We demonstrated that, while no uptake of albumin was observed in the undifferentiated Cys-uKPC (Cys-uKPC #1), effective endocytosis of albumin was present in Cys-uKPC-Podo (Cys-uKPC #1-Podo; Figure 3E,F), comparable with a conditionally immortalized cystinosis podocyte (ciPodocyteCTNS−/−). The gene discussed is ALB; the disease is cystinosis.