Proliferation of TCRVβ⁺ versus TCRVβ⁻ cells. (A) Representative histogram plots of CFSE-labeled cells after 4 days of culture stimulated at a bead to cell ratio of 1:10, demonstrating the low number of TCRVβ⁺ cells that proliferated. (B) Scatterplot of percentage of cells that proliferated in TCRVβ⁺ versus TCRVβ⁻ cells for 9 different expansions (t = 7.73; P < .001).