Aquaporins facilitate the transport of water and small neutral solutes across cell membranes. Expressed in roots and leaves, and at lower levels in anthers. Aquaporins contain two tandem repeats each containing three membrane-spanning domains and a pore-forming loop with the signature motif Asn-Pro-Ala (NPA). Belongs to the MIP/aquaporin (TC 1.A.8) family. NIP (TC 1.A.8.12) subfamily. Was originally thought to correspond to two different genes Os01g0202800 and Os01g0202900. Was originally thought to correspond to two different genes Os01g0202800 and Os01g0202900.