Table 1.
Classification of aquaporin sequences from phylogenetic analyses
| Name | Organism | Glycerol permeability |
| AQP subfamily (classical aquaporins) | ||
| AQP0 | Mammals | No |
| AQP1 | Mammals | No |
| AQP2 | Mammals | No |
| AQP4 | Mammals | No |
| AQP5 | Mammals | No |
| AQP6 | Mammals | No |
| AQP8 | Mammals | No |
| AQPZ | E. coli | No |
| AQY1 | Yeast | No |
| AQY2 | Yeast | No |
| Plasma-membrane intrinsic proteins (PIPs) | Plants | * |
| Tonoplast intrinsic proteins (TIPs) | Plants | * |
| Nodulin-like intrinsic proteins (NIPs or NLMs) | Plants | * |
| Small basic intrinsic proteins (SIPs) | Plants | NK |
| GLP subfamily | ||
| AQP3 | Mammals | Yes |
| AQP7 | Mammals | Yes |
| AQP9 | Mammals | Yes |
| AQP10 | Mammals | Yes |
| GlpF | E. coli | Yes |
| GLPY1 | Yeast | Yes |
| GLPY2 | Yeast | Yes |
*Glycerol permeability has been demonstrated for individual members of the subgroup. NK, not known.