The discs may include perimeters having {HEAD ~ ovular or elliptical shapes} that cooperate with {TAIL ~ a cylindrical interior wall} of the housing to cut tissue specimens 
cooperate with
The discs may include perimeters having { HEAD ~ ovular or elliptical shapes } that cooperate with { TAIL ~ a cylindrical interior wall } of the housing to cut tissue specimens
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH