ATPUP16 (Arabidopsis thaliana purine permease 16); purine transmembrane transporter. Identical to Probable purine permease 16 (PUP16) [Arabidopsis Thaliana] (GB:O04508); similar to purine permease-related [Arabidopsis thaliana] (TAIR:AT1G57980.1); similar to hypothetical protein [Vitis vinifera] (GB:CAN73056.1); contains InterPro domain Protein of unknown function DUF250 (InterPro:IPR004853)