Effect of cytokines on the antibody response to hgp75/TRP-1. Groups of three C57BL/6 mice were immunized five times with hgp75/TRP-1 preceded by treatment with various murine cytokine DNA constructs or control (null) plasmid. Sera were analyzed for the presence of antibodies detecting hgp75/TRP-1 in an immunoprecipitation-Western blot assay. Results are representative of all three mice per group (GM = GM-CSF).