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