Antibodies are proteins produced by lymphocytes as a result of an immune response. the antibodies can fight

The antibodies can fight Infections and eliminate antigens.

Explanation:

Antibodies or immunoglobulins are protective protein produced by the lymphocytes of immune system in response to foreign substance called antigens. Antibodies recognise and bind to antigens in order to remove them from the body.

When a foreign substance enter the body, the immune system is able to recognise it as foreign because antigen molecules on the surface differ from the body, the immune system produce antibodies to eliminate it.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.