Cover: False-colour images of cross-sections of the beating mouse heart acquired using cine-magnetic resonance imaging (MRI) at the apical (top row), mid-ventricular (middle row) and basal (bottom row) levels throughout the cardiac cycle (left to right). Such images are used to investigate cardiac morphology and quantify function in vivo. See article by Hasham et al. on page 259. Cover image by D. Stuckey is licensed under a Creative Commons Attribution 4.0 International licence.