CXCL13 and neoplasm: First, tumor nodules in histologic sections of mice upon BaP treatment were analyzed as described (Tan et al., 2013), and the results showed that at treatment time points of 120 days, 180 days, and 240 days, Cxcl13-/- mice had much fewer lesions than Cxcl13+/- and Cxcl13+/+ mice (Figure 4A).