The majority of FasL⁺ splenocytes are B cells.

<p>Splenocytes from naïve mice were stained for surface expression of FasL and the cellular composition of FasL⁻ and FasL⁺ subsets was examined by flow cytometry. (<b>A</b>) Representative dot plots of splenocytes stained with a T cell marker (CD3) and three independent B cell markers (B220, CD19, and IgM). (<b>B</b>) The frequency (mean ± SEM) of cells staining positive for the markers presented in (A) among FasL⁺ splenocytes. Data are representative of more than 5 independent experiments with at least three animals per experiment.