Antitumor effect of CD62L^– T cells from BCL1-primed C57BL/6 mice. T cells from BCL1-primed C57BL/6 mice were injected together with 1 × 10⁴ purified BCL1 cells into B6 SCID mice. Development of BCL1 leukemia was monitored by flow cytometry using anti-BCL1 idiotype antibody. (A) Flow cytometric analysis of BCL1 cells in peripheral blood. The percentages represent BCL1 cells in peripheral blood obtained on day 35. (B) Survival; P < 001, BCL1 only versus other groups.