On the cover: Synthetic strands of murine neonatal atrial cardiomyocytes. Top, Immunohistochemical labeling of connexin40 (Cx40, green) and connexin43 (Cx43, red). Yellow fluorescence denotes colocalization of Cx40 and Cx43. Bottom, Immunohistochemical labeling of peptidyl-glycine-α-amidating monooxygenase (red), and cytochemical staining of nuclear DNA (DAPI, blue). See related article, page 1216.