{TAIL ~ The apparatus}, when used with a centrifuge, allows for {HEAD ~ the creation} of at least three fractions in the apparatus 
{ TAIL ~ The apparatus } , when used with a centrifuge , allows for { HEAD ~ the creation } of at least three fractions in the apparatus
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH