Figure 3.

4-MU is taken up by leukocytes in vivo. Mice were treated with 4-MU. Signal on different cell subsets in the blood was analyzed by flow cytometry, as measured in the Pacific Blue channel, before and 2, 7, and 14 days after start of treatment. Bold histograms depict signal in 4-MU treated mice, tinted histograms depict background Pacific Blue signal in untreated mice.