Question

__________ is an antigen in the high-prevalence series that is found in saliva and urine. The corresponding antibody typically reacts at the AHG phase and produces a characteristic retractile, mixed-field reaction.

Answer 1

The antigen found in high concentrations in saliva and urine that produces a characteristic mixed-field reaction is likely IgA, which plays a vital role in mucosal immunity.

Step-by-step explanation:

The antigen in question is likely IgA, an important immunoglobulin found in secretions such as saliva and urine. IgA is predominantly found in a dimeric form, which allows it to be secreted into bodily fluids. This type of antigen interacts with its corresponding antibody during the Anti-Human Globulin (AHG) phase and can demonstrate a mixed-field reaction that is characteristic of certain blood group antigen-antibody interactions.