Aquaporins are a family of small integral membrane proteins related to the major intrinsic protein (MIP or AQP0). Thisgene encodes an aquaporin which functions as a molecular water channel protein. It is a homotetramer with 6 bilayerspanning domains and N-glycosylation sites. The protein physically resembles channel proteins and is abundant inerythrocytes and renal tubes. The gene encoding this aquaporin is a possible candidate for disorders involvingimbalance in ocular fluid movement. (provided by RefSeq)