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