Figure 2B. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S1567-133X(03)00125-X] Gene Expr Patterns 3: 777-83, Garcia-Frigola C; Shi Y; Evans SM, "Expression of the hyperpolarization-activated cyclic nucleotide-gated cation channel HCN4 during mouse heart development." Copyright 2003. [PMID:14643687]