{HEAD ~ The discs} may include inwardly directed notches formed in their outer perimeter, with the notches cooperating with an interior wall of {TAIL ~ the housing} to cut tissue specimens 
{ HEAD ~ The discs } may include inwardly directed notches formed in their outer perimeter , with the notches cooperating with an interior wall of { TAIL ~ the housing } to cut tissue specimens
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH