Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At3g55740	Proline transporter that mediates proline and glycine betaine transport.	Identification and characterization of GABA, proline and quaternary ammonium compound transporters from Arabidopsis thaliana.; 1999; DOI: 10.1016/s0014-5793(99)00516-5; PMID: 10359089; https://pubmed.ncbi.nlm.nih.gov/10359089/ | The AtProT family. Compatible solute transporters with similar substrate specificity but differential expression patterns.; 2005; DOI: 10.1104/pp.104.055079; PMID: 15618414; https://pubmed.ncbi.nlm.nih.gov/15618414/ | In planta function of compatible solute transporters of the AtProT family.; 2011; DOI: 10.1093/jxb/erq320; PMID: 20959625; https://pubmed.ncbi.nlm.nih.gov/20959625/ | Salt stress-induced proline transporters and salt stress-repressed broad specificity amino acid permeases identified by suppression of a yeast amino acid permease-targeting mutant.; 1996; DOI: 10.1105/tpc.8.8.1437; PMID: 8776904; https://pubmed.ncbi.nlm.nih.gov/8776904/
Arabidopsis	At2g39890	Proline transporter that mediates proline and glycine betaine transport.	The AtProT family. Compatible solute transporters with similar substrate specificity but differential expression patterns.; 2005; DOI: 10.1104/pp.104.055079; PMID: 15618414; https://pubmed.ncbi.nlm.nih.gov/15618414/ | Salt stress-induced proline transporters and salt stress-repressed broad specificity amino acid permeases identified by suppression of a yeast amino acid permease-targeting mutant.; 1996; DOI: 10.1105/tpc.8.8.1437; PMID: 8776904; https://pubmed.ncbi.nlm.nih.gov/8776904/
Arabidopsis	At2g36590	Proline transporter that mediates proline and glycine betaine transport.	The AtProT family. Compatible solute transporters with similar substrate specificity but differential expression patterns.; 2005; DOI: 10.1104/pp.104.055079; PMID: 15618414; https://pubmed.ncbi.nlm.nih.gov/15618414/
Rice	UniProt: Q69LA1	Proline transporter that mediates proline transport across the plasma membrane.	No verified direct reference in this release
Rice	Os03g0644400	Proline transporter that mediates proline transport across the plasma membrane when expressed in a heterologous system (Xenopus oocytes).	Molecular cloning and characterization of a cDNA encoding proline transporter in rice.; 2000; DOI: 10.1093/pcp/41.6.750; PMID: 10945345; https://pubmed.ncbi.nlm.nih.gov/10945345/