Mapping PPDK. (A) Phylogenetic tree of representative C4-PPDK sequences showing the clear separation of the two paralogous sequences. (B) Placement of the C4-PPDK markers, EBI 847 and EBI 848 (pink) on the linkage map. (C) Synteny of corresponding linkage groups (Ms16 and Ms17) to Sorghum chromosome 9. The position of PPDK is illustrated by the black arrows.