{HEAD ~ One screen} may cooperate with another screen to provide shearing of {TAIL ~ the tissue} specimens 
{ HEAD ~ One screen } may cooperate with another screen to provide shearing of { TAIL ~ the tissue } specimens
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH