Fig. 7

Comparison of ranks. (a) Scatter plot showing, for each target gene, the rank of the best ranked gene for each studied method. Target genes are sorted by increasing mean expression values. Symbols of genes for which the qPCR normalized profiles are equal (equal Tuckey tests) are surrounded with black color. (b) Bar plot showing, for each studied method, the number of genes that have been ranked at 1st, 2nd, and 3rd positions (gold, silver, and bronze colors). (c) Boxplots of ranks for each type of reference gene, obtained with the twelve target genes.