Issues

Cover picture: Expression of the muscarinic-activated K⁺ channel protein Girk4 (red, middle) in the sino-atrial node (SAN) region and its boundaries, the superior vena cava and the right atrium. SAN pacemaker cells, identified here with an antibody against the HCN4 channel isoform (green, left), coexpress Girk4 and HCN4 (right). CT, crista terminalis; IVC, inferior vena cava; RA, right atrium; SVC, superior vena cava (see research article by Mesirca et al., 113–126).