May form a water-specific channel (By similarity). Required for prolonged spore survival on fruiting bodies. First detected at the tight mound stage. Highly expressed in fingers and late culminants. In slugs, detected in prespore cells, but not in prestalk cells. Constitutively expressed during hyperosmotic stress. Aquaporins contain two tandem repeats each containing three membrane-spanning domains and a pore-forming loop with the signature motif Asn-Pro-Ala (NPA). Here, the second motif is Asn-Pro-Val (NPV). Belongs to the MIP/aquaporin (TC 1.A.8) family.