Sequence similarity tree of 6PGDH enzymes. Sequence similarity tree of 6PGDH enzymes from maize (Zm), rice (Os), Arabidopsis (At), spinach, Chlamydomonas reinhardtii, and Synechocystis sp. PCC 6803. Rice and Arabidopsis proteins are identified by their locus numbers. The protein sequences used to generate the ClustalW alignment and tree were from the ORF of the Pgd3 locus and Genbank accessions: AAC27702, AAC27703, AAK49897, AAK51690, AAL76323, AAO42814, ABA93694, NP_198982, NP_442035, NP_850502, NP_910282.