In vivo migration assays of 164T2 and 267T2 lymphoma cells. Cells were labeled with ¹¹¹In and 10⁶cells were injected intravenously. Radioactivity was counted in the organs at different times and expressed as the percentage of total radioactivity injected. Data represent the mean values ± standard deviation of five determinations based on three independent experiments. (▪) 164T2 cells; (□) 267T2 cells.