▁that ▁ 1 6 S ▁r R NA . ▁ ▁The ▁pp k 1 ▁ph y log eny ▁is ▁more ▁frequently ▁used ▁and ▁groups ▁C AP ▁into ▁two ▁major ▁divisions : ▁type ▁I ▁and ▁type ▁II . ▁ ▁Each ▁of ▁these ▁types ▁has ▁a ▁number ▁of ▁cl ades ▁that ▁are ▁given ▁a ▁letter ▁design ation , ▁e . g . ▁I A , ▁II A , ▁II B , ▁II C . ▁ ▁An ▁environmental ▁survey ▁of ▁waste water ▁treatment ▁plants ▁and ▁natural ▁water ways ▁in ▁California ▁and ▁Wisconsin ▁in ▁the ▁USA ▁revealed ▁ ▁at ▁least ▁five ▁C AP ▁I ▁( IA ▁.. ▁IE ) ▁cl ades ▁and ▁seven ▁C AP ▁II ▁( II A ▁.. ▁II G ) ▁cl ades . ▁ ▁Met abol ism ▁C AP ▁has ▁yet ▁to ▁be ▁cult ured , ▁but ▁the ▁ability ▁to ▁en rich ▁lab - scale ▁E B PR ▁communities ▁with ▁up ▁to ▁ 8 0 % ▁C AP ▁ ▁has ▁enabled ▁research ▁into ▁its ▁met abol ism ▁using ▁meta - omic ▁approaches . ▁ ▁E B PR ▁is ▁generally ▁associated ▁with ▁three ▁stages : ▁an a er ob ic , ▁aer ob ic , ▁and ▁sett ling . ▁ ▁For ▁C AP ▁to ▁domin ate ▁in ▁E B PR ▁react ors , ▁they ▁must ▁be ▁able ▁to ▁th rive ▁under ▁these ▁conditions . ▁ ▁During ▁the ▁an a er ob ic ▁phase , ▁C AP ▁can ▁take ▁up ▁vol atile ▁fat ty ▁ac ids ▁and ▁store ▁these ▁simple ▁carbon ▁sources ▁int rac ell ular