Cover image

Confocal fluorescent image of the endoplasmic reticulum (ER) network assembled from interphase-arrested Xenopus egg extracts. For details, see the protocol by Songyu Wang, Fabian Romano, and Tom Rapoport in this issue (doi: 10.1101/pdb.prot097204). Image acquired by Fabian Romano in the Nikon Imaging Center at Harvard Medical School and modified from Wang et al. (2013; J Cell Biol 203: 801–814).