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