{HEAD ~ The platelet rich plasma} flows into {TAIL ~ the second part} and is separated into platelet poor plasma and platelets 
flows into
{ HEAD ~ The platelet rich plasma } flows into { TAIL ~ the second part } and is separated into platelet poor plasma and platelets
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH