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