An antibody targeted to {HEAD ~ an antigen} is brought into contact with {TAIL ~ a body component} in situ 
An antibody targeted to { HEAD ~ an antigen } is brought into contact with { TAIL ~ a body component } in situ
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH