Cover photograph: Hyphomonas neptunium division stalks contain helical bundles; a central slice of a tomogram is shown on the left (scale bar, 100 nm). A three-dimensional (3D) segmentation of the bundle is show in the middle. Prosthecobacter debontii displays novel appendages on the prostheca cell surface; a tomographic slice with three appendages in view is shown on the right. The inset shows a 3D isosurface of the average of 105 appendages. (See related article at e00100–17.) (Copyright © 2017 American Society for Microbiology. All Rights Reserved.)