Method and apparatus for separating serum or {HEAD ~ plasma} from {TAIL ~ the formed elements} of the blood 
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Method and apparatus for separating serum or { HEAD ~ plasma } from { TAIL ~ the formed elements } of the blood
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH