Cover photograph: Skeletal preparations of embryonic day 18.5 mouse heads stained with alizarin red and alcian blue show the distal truncation of the lower jaw in Islet1^fx/fx; Shh-Cre mice (bottom) compared to that of the wild type (top). (See related article at e00590–16.) (Copyright © 2017 American Society for Microbiology. All Rights Reserved.)