Hierarchical cluster analysis of significant regulated genes. Hierarchical cluster analysis (HCA) of genes with a p-value <0.05 and a fold change >1.5 (fold changes calculated for each individual DHEA exposed animal versus the mean of all control animals) for (A) intramuscularly and (B) orally treated animals. Based on 2log mean centered ratios, HCA was performed on genes only using average linkage clustering. Colour scales are ranging from bright red to bright green which correspond with respectively up- or down-regulated genes. Maximum brightness represents a fold change of ≥ 2 (2log mean centered ratios of ≤ -1 or ≥ 1).