Veterans Affairs Portland Health Care System 1 article published in JoVE Medicine Optical Clearing and Imaging of Immunolabeled Kidney Tissue Turgay Saritas1, Victor G. Puelles1,2,3, Xiao-Tong Su4, David H. Ellison4,5,6, Rafael Kramann1,7 1Division of Nephrology and Clinical Immunology, University Hospital RWTH Aachen, 2III. Department of Medicine, University Medical Center, Hamburg-Eppendorf, 3Department of Nephrology, Monash Health, 4Division of Nephrology and Hypertension, Oregon Health and Science University, 5Renal Section, Veterans Affairs Portland Health Care System, 6Fondation LeDucq Transatlantic Networks of Excellence, 7Department of Internal Medicine, Nephrology and Transplantation, Erasmus Medical Center The combination of antibody labeling, optical clearing, and advanced light microscopy allows three-dimensional analysis of complete structures or organs. Described here is a simple method to combine immunolabeling of thick kidney slices, optical clearing with ethyl cinnamate, and confocal imaging that enables visualization and quantification of three-dimensional kidney structures.