# OC Root 2nd 3rd 4th PC Gene/Definition OC.40648 Bacteria.24142 Proteobacteria.177629 Gammaproteobacteria.413408 gai.3764 gai:IMCC3135_19955 oppD_4; Oligopeptide transport ATP-binding protein OppD; K02031 peptide/nickel transport system ATP-binding protein