Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At5g03555	Nucleobase-proton symporter that facilitates the uptake of nucleobases in the cells.	De novo pyrimidine nucleotide synthesis mainly occurs outside of plastids, but a previously undiscovered nucleobase importer provides substrates for the essential salvage pathway in Arabidopsis.; 2012; DOI: 10.1105/tpc.112.096743; PMID: 22474184; https://pubmed.ncbi.nlm.nih.gov/22474184/ | Genetic and molecular characterization reveals a unique nucleobase cation symporter 1 in Arabidopsis.; 2012; DOI: 10.1016/j.febslet.2012.03.058; PMID: 22616996; https://pubmed.ncbi.nlm.nih.gov/22616996/ | Structure-function relationship of a plant NCS1 member--homology modeling and mutagenesis identified residues critical for substrate specificity of PLUTO, a nucleobase transporter from Arabidopsis.; 2014; DOI: 10.1371/journal.pone.0091343; PMID: 24621654; https://pubmed.ncbi.nlm.nih.gov/24621654/