A cuvette has been used to exemplify one embodiment of {HEAD ~ the invention} involving {TAIL ~ a flow} through system 
involving
A cuvette has been used to exemplify one embodiment of { HEAD ~ the invention } involving { TAIL ~ a flow } through system
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH