Figure 4From: An integrated functional genomic study of acute phenobarbital exposure in the ratHierarchical clustering of transcriptomic data. Hierarchical clustering using Pearson correlation coefficients revealed different temporal patterns of gene expression changes due to exposure to phenobarbital. Some genes were transiently upregulated at early time points (A &B), whereas others showed a sustained decrease (C) or increase (D) in expression.Back to article page