In accordance with this object, {HEAD ~ means} are provided adjacent {TAIL ~ the valve opening} for deflecting serum or plasma passing therethrough 
In accordance with this object , { HEAD ~ means } are provided adjacent { TAIL ~ the valve opening } for deflecting serum or plasma passing therethrough
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH