The algal turf naturally has a surface comprising {HEAD ~ the cell walls} of {TAIL ~ the algae} 
of
The algal turf naturally has a surface comprising { HEAD ~ the cell walls } of { TAIL ~ the algae }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL