CD80 and neoplasm: When pooled serum (n = 5 for each group) from naïve mice, tumor-bearing mice, mice treated with PC61 alone, or mice treated with two weekly injections of the vaccine cell-line AGN2a-CD80/CD86 alone was used to screen the cDNA library 0, 0, 0, or 5 unique clones, respectively, were identified.