Overview of lymphocyte populations in patients before and after one year of natalizumab treatment.

<p><b>a</b>: Distribution of lymphocytes (% of total leukocytes). Comparisons are pairwise. Bars denote mean values. <b>b</b>-<b>c</b>: Relative distribution of discrete lymphocyte subpopulations before (b) and after (c) natalizumab treatment.