ATPUP4 (Arabidopsis thaliana purine permease 4); purine transmembrane transporter. Identical to Probable purine permease 4 (PUP4) [Arabidopsis Thaliana] (GB:Q9SY29); similar to PUP1 (PURINE PERMEASE 1), purine transmembrane transporter [Arabidopsis thaliana] (TAIR:AT1G28230.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO44474.1); contains InterPro domain Protein of unknown function DUF6, transmembrane; (InterPro:IPR000620); contains InterPro domain Protein of unknown function DUF250 (InterPro:IPR004853)