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