| http://www.w3.org/ns/prov#value | - Such testing may be performed utilizing any standard technique, including ELISA, in which a patient's serum may be tested for the presence of anti-retroviral antibodies by exposing the serum to immobilized retrovirus or retroviral antigen, and then the binding of antibody to immobilized virus or antigen is detected (e.g. by binding of a second labeled antibody capable of reacting with the antibody
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