Summary of NCBI gene annotations for PNPOx-like proteins in selected organisms that contain pdx1 and pdx2 and the role of PNPOx is considered to be for PLP salvage.

Homologs were assigned using protein basic local alignment search tool (pBLAST) [26] for sequence alignments with E-values below 10−6. Percent identity (PI) is shown to the right of each gene annotation, which has been calculated by dividing the number of identical residues by the length of the alignment.