PMC2193006_01
Flow cytometric analysis of Fas antigen. All cell lines but one (K562) expressed the Fas antigen on their surfaces. Cells were incubated with IgG anti-Fas mAb (solid line) or control mAb (dashed line).
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F1
The resulting histograms (see Fig. 1) correspond to the cell number (y-axis) versus fluorescence intensity (x-axis) plotted on a logarithmic scale. 