Whole transcriptome analysis using Affymetrix Human Gene 2.0 ST gene array. (a) Global gene expression profile of triplicate samples of undifferentiated human iPS cells, iPS-derived podocytes, and an immortalized human glomerular podocyte cell line (PCL). (b) Expression levels of genes involved in pluripotency, development of nephrogenic progenitors, or lineage specification and functional maturation of kidney glomerular podocytes. Each replicate represents an independent experiment. See also Supplementary Data 1 and 2. Heatmaps depict genes that are up-regulated (red), down-regulated (blue), and unchanged (white).