Aquaporins 8 Arabidopsis 8 Arabidopsis Proteins 8 Arabidopsis thaliana 8 Pollen tube Urea 8 Water 8 aquaporin 8 article 8 urea 8 Amino acids 4 Animals 4 Arabidopsis protein 4 Biological Transport 4 DNA fingerprinting 4 Double mutants 4 Gene Expression Regulation, Plant 4 Glycoproteins 4 Hydrogen-Ion Concentration 4 In-vitro 4 Metabolism 4 Mitochondria 4 Mutagenesis, Insertional 4 Nitrogen 4 Phylogeny 4 Plant sexual reproduction 4 Pollen 4 Pollen Tube 4 Pollen hydration 4 RNA, Plant 4