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