Cover image: Fluorescence image (magnification 4X) of the radial growth of sensory neurons (axons stained in green, somas in blue and actin filaments in red), by Dr. María Alejandra Lopez-Verrilli, Pontificia Universidad Católica de Chile, Facultad de Ciencias Biológicas, Santiago, Chile. Courtesy of Nikon Small World (Image of Distinction, 2012 Photomicrography Competition, https://www.nikonsmallworld.com).