Antibody/antigen complex may then be amplified to an appropriate level, and {HEAD ~ a second step antibody} is brought into {TAIL ~ contact} with the antibody/antigen complex to render the complex macroscopically detectable 
is brought into
Antibody / antigen complex may then be amplified to an appropriate level , and { HEAD ~ a second step antibody } is brought into { TAIL ~ contact } with the antibody / antigen complex to render the complex macroscopically detectable
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH