Figure 2. Tumor growth in mice in the drug vehicle treatment condition. Tumor weights (mean ± standard error) from 11 to 18 days after tumor cell injection and formation of social housing conditions (n = 5, II; n = 10, IG; n = 6, GG; n = 5, GI). Tumor growth rates at 16 to 18 days after tumor cell injection and formation of social housing conditions: GI > II = GG > IG (p values <.05).