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Comparison of pore radius profiles. Pore diameter profiles of water-specific SoPIP2;1 (PDB ID: 1Z98), glycerol-specific GlpF (PDB ID: 1FX8), OsTIP4;2 and OsNIP2;1 calculated using HOLE [63]. The black arrow indicates the approximate location of ar/R constriction region. The position Z = 0 Å corresponds to the location of NPA region.
