are water channel proteins that permit faster transport of water through
cellular membranes. They were discovered in plants in 1994 (Maurel et
form a large gene family of about 35 genes. This family has four subfamilies.
Tonoplast Intrinsic Proteins (TIPs)
> Plasma Membrane Intrinsic Proteins (PIPs)
> Nodule-Like-MIP Integral Proteins (NIPs)
> Basic Intrinsic Proteins (SIPs).