Plasma membrane Ca2+-ATPases (PMCAs) are integral membrane proteins essential to the control of intracellular Ca2+ ([Ca2+]i) concentration. Four genes encode PMCA proteins termed PMCA1-PMCA4. Little is known about the expression of these isoforms in corneal epithelium (CE). The purpose of this investigation is to characterize the expression and distribution of PMCAs in human CE (hCE).