Residues from helices 2 and 5 and the E loop of these proteins form the  aromatic/arginine ("aromatic slash arginine") constriction region toward the extracellular side, which determines their  selectivity.
An autoimmune reaction to one of these proteins in astrocytes causes neuromyelitis optica. Some regions of these proteins  contain a highly conserved "N-P-A" motif. Residues from helices 2 and 5 and the E loop of these proteins form the  aromatic/arginine ("aromatic slash arginine") constriction region toward the extracellular side, which determines their  selectivity. These proteins form one branch within the Major Intrinsic Proteins family. Inadequate expression of these  proteins can lead to (*) nephrogenic diabetes insipidus, and the insertion of these proteins into apical membranes of epithelial  cells is triggered by vasopression to allow for increased urine concentration and decreased dehydration. For 10 points, name these  integral membrane transport proteins that regulate the flow of water into and out of the cell.
An autoimmune reaction to one of these proteins in astrocytes causes neuromyelitis optica.
aquaporins [accept AQPs; accept aquaglyceroporins because I don’t think those are every ruled out; prompt on  “water channels”]  5