The device includes a fluid channel having a surface and {HEAD ~ an object} such as {TAIL ~ a bacterium} or virus may flow through the fluid channel 
such as
The device includes a fluid channel having a surface and { HEAD ~ an object } such as { TAIL ~ a bacterium } or virus may flow through the fluid channel
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH