a flow cell in which {TAIL ~ the object} to be measured flows throughout {HEAD ~ a region} irradiated with the laser light 
a flow cell in which { TAIL ~ the object } to be measured flows throughout { HEAD ~ a region } irradiated with the laser light
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH