<p>The results for control macrophages are expressed as the median value and range, and are set at 100%. The effect of secretions is expressed as a percentage relative to the production of growth factors by control cells. Results are means±SEM of at least six experiments. Values are significantly (*p<0.05 and **p<0.005) different from those for macrophages stimulated with LPS. ND: not detectable.</p
