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Fluorescence polarization measurements with the probe 1,6-diphenyl-1,3,5-hexatriene (DPH) were performed to detect changes in the fluidity of plasma membranes from T-lymphocytes stimulated with mitogens. When the cells were incubated with succinyl-concanavalin A an increase in fluorescence polarization was observed. This, however, could be shown to be due to the interaction of the mitogen with the label DPH and did not reflect changes in the plasma membrane. In purified plasma membranes a decrease rather than an increase of fluorescence polarization was observed.

Pitfalls in Measuring Fluorescence Polarization in Mitogen-Stimulated T-Lymphocytes