Ranges of Ct values of the 11 pre-selected reference genes in control and LPS stimulated BMDMs at 6 h and 24 h. Ct values were recorded for control and LPS stimulated (10 ng/ml) BMDMs at (a) 6 h and (b). 24 h. Plotted as boxes are the range of Ct values, with the included horizontal line identifying the mean, of triplicate biological replicates. The unfilled boxes represent control BMDMs, and the grey filled boxes represent LPS stimulated BMDMs