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