# OC Root 2nd 3rd 4th 5th PC Gene/Definition OC.40641 Bacteria.24446 Proteobacteria.397333 Alphaproteobacteria.224482 Martelella.5974 mmed.505 mmed:Mame_00447 ddpD_2; putative D,D-dipeptide transport ATP-binding protein DdpD; K02031 peptide/nickel transport system ATP-binding protein