...in obligatory parasites/symbionts such as Mycoplasma , Rickettsia , Wolbachia , and Buchnera . These three clusters include metabolic and housekeeping genes (e.g., ilvC , pdhAa
, pdhAb , mdh , pckA , ppiB , hemA , ccmAC , cycLJK , relA , tig , greA , purl , ntrC , glnB , glgA1 , pgm , queA , acpxL
, lps...