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