Microbes may obtain {HEAD ~ energy} from {TAIL ~ a feedstock} or material through a metabolic process 
from
Microbes may obtain { HEAD ~ energy } from { TAIL ~ a feedstock } or material through a metabolic process
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH