In vivo BrdUrd incorporation kinetics of KTSL−/lo and KTSL− cells. In vivo BrdUrd incorporation kinetics of KTSL−/lo and KTSL− cells. (A) BrdUrd incorporation rate of KTSL−/lo cells (□) and KTSL− cells (●). Each data point represents mean percentages of BrdUrd positive HSC from at least two separate experiments with a combined analysis of at least 500 cells. Some error bars are smaller than their associated symbol. (B) BrdUrd incorporation means plotted in semilogarithmic fashion as the proportion of BrdUrd-negative KTSL−/lo cells (□) and KTSL− cells (●) against time in days. The lines were generated by using least squares fit linear regression. Samuel H. Cheshier et al. PNAS 1999;96:6:3120-3125 ©1999 by National Academy of Sciences