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