{TAIL ~ Biological substances} are observed by employing a high internal gradient magnetic capture structure formed within a vessel, in conjunction with an externally applied force for transporting magnetically responsive material toward {HEAD ~ the capture structure} 
{ TAIL ~ Biological substances } are observed by employing a high internal gradient magnetic capture structure formed within a vessel , in conjunction with an externally applied force for transporting magnetically responsive material toward { HEAD ~ the capture structure }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD