The population of DLCs is stable in size. Id-immune mice carrying dormant tumors were killed at various times. The number of large λ⁺₃ cells was determined by FACS analysis. The number in each column indicates the number of mice analyzed for that time frame with the standard deviation indicated by the error bars. The average number of λ⁺₃ cells in Id-immune animals not injected with BCL₁ cells (normal B-cell blasts, 0.24 ± 0.09; N = 6) was subtracted from the value obtained for each animal before each group was averaged. The percentage of dormant tumor is the percentage of corrected λ⁺₃ cells in the total splenocyte population for each animal.