AQP2 and autosomal dominant polycystic kidney disease: AQP2 (blue), Na+/K+ ATPase (red) and F-actin (green) stains for cortical cells (NHKc), medullary cells (NHKm) and cystic cells (ADPKD) in MFKP showed the same distribution and morphology as those obtained from immunohistochemistry images of kidney tissue sections (Supplementary Fig. 10a–d, f–k), suggesting that our device is capturing the general organization of these different types of epithelia.