Figure 4 'Reprogramming' of fibroblasts. Expression profiles of genes whose function is likely to play a role in the reprogramming phase of the response are shown using the same representation as in Figure 2. In the cases in which a gene was represented by more than one element in the microarray, all measurements are shown. The genes were grouped into categories based on our knowledge of their most likely role. Some genes with pleiotropic roles were included in more than one category.