{HEAD ~ Magnetic separation apparatus} and methods employing an internal magnetic capture gradient and {TAIL ~ an external transport force} 
employing
{ HEAD ~ Magnetic separation apparatus } and methods employing an internal magnetic capture gradient and { TAIL ~ an external transport force }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL