Expression patterns of selected genes involved signaling pathways for cell plasticity, growth and differentiation: (A) nitric oxide signaling (NOS) pathway (28 genes); (B) WNT pathway (23 genes); (C) stem cell signaling (27 genes). Relative transcript abundance normalized per gene across four time points are visualized with ‘cascade plots’. The order of genes from top to bottom was generated according to expression at each time point. The diagrams were scaled to the same size. Transcript abundance is color coded from low (red) to high (yellow).