Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At1g28230	Proton-coupled purine transporter mediating adenine and trans-zeatin uptake.	Transport of cytokinins mediated by purine transporters of the PUP family expressed in phloem, hydathodes, and pollen of Arabidopsis.; 2003; DOI: 10.1046/j.1365-313x.2003.01700.x; PMID: 12662305; https://pubmed.ncbi.nlm.nih.gov/12662305/ | Recycling of pyridoxine (vitamin B6) by PUP1 in Arabidopsis.; 2013; DOI: 10.1111/tpj.12195; PMID: 23551747; https://pubmed.ncbi.nlm.nih.gov/23551747/
Arabidopsis	At1g28220	May be involved in transport of purine derivatives during pollen germination and tube elongation.	Transport of cytokinins mediated by purine transporters of the PUP family expressed in phloem, hydathodes, and pollen of Arabidopsis.; 2003; DOI: 10.1046/j.1365-313x.2003.01700.x; PMID: 12662305; https://pubmed.ncbi.nlm.nih.gov/12662305/
Arabidopsis	At2g33750	Mediates adenine transport.	Transport of cytokinins mediated by purine transporters of the PUP family expressed in phloem, hydathodes, and pollen of Arabidopsis.; 2003; DOI: 10.1046/j.1365-313x.2003.01700.x; PMID: 12662305; https://pubmed.ncbi.nlm.nih.gov/12662305/
Arabidopsis	At4g18210	Probable purine permease 10.	No verified direct reference in this release
Arabidopsis	At4g18195	Probable purine permease 8.	No verified direct reference in this release