A separator tube for {TAIL ~ insertion} into a collection tube comprises {HEAD ~ a tubular member} having one end closed by a plug 
A separator tube for { TAIL ~ insertion } into a collection tube comprises { HEAD ~ a tubular member } having one end closed by a plug
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH