{HEAD ~ The methanotrophic microorganisms} 21 can be comprised of {TAIL ~ either a single bacterial species} or a consortia of several bacterial species, and other microorganisms 
comprised of
{ HEAD ~ The methanotrophic microorganisms } 21 can be comprised of { TAIL ~ either a single bacterial species } or a consortia of several bacterial species , and other microorganisms
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH