<p><b>A.</b> Cells treated with LIF in presence and absence of a blocking antibody to LIFR which reduced immunofluorescence for LIFR (green) and iNOS (red). Blue: nuclear staining with DAPI. Scale bar: 50 µm. <b>B</b>.-Quantification of the average iNOS fluorescence intensity shown in A normalized respect to the control group in three independent experiments. * p<0.05.</p