part of start stage end stage renal tubule renal principal cell A cuboidal epithelial cell of the kidney which regulates sodium and potassium balance. The activity of sodium and potassium channels on the cells apical membrane is regulated by aldosterone and vasopressin. In mammals these cells are located in the renal collecting ducts. zebrafish_anatomy ZFA:0009373 CL:0005009 ZFA:0005322 2010-02-10T06:32:34Z Ceri TAO:0005322 columnar/cuboidal epithelial cell kidney epithelial cell larval:days 7-13 adult