Empty space 8 above {HEAD ~ the bead layer} 4, 5 and 6 may facilitate {TAIL ~ specimen flow} and allow mechanical detachment depicted in FIG 5 
Empty space 8 above { HEAD ~ the bead layer } 4 , 5 and 6 may facilitate { TAIL ~ specimen flow } and allow mechanical detachment depicted in FIG 5
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH