Overview of kidney epithelial and endothelial cell types. The various epithelial and endothelial cell types and subtypes of the kidney are numbered and annotated in the subpanel representing the functional unit of the kidney, the nephron. Kidney-resident immune cells are not included in the schematic. Abbreviations: ATL, ascending thin limb of loop of Henle; CD, collecting duct; CD-IC, collecting duct intercalated cell; CD-PC, collecting duct principal cell; CD-Trans, collecting duct transitional cell; DCT1/2, distal convoluted tubule 1 or 2; DTL, descending thin limb of loop of Henle; Glom, glomerulus; TAL, thick ascending limb of loop of Henle.