Cover legend: This image shows peripheral nerves and branches of the respiratory system of a thirdinstar Drosophila melanogaster. Perineurial glia are blue; horseradish peroxidase, which is taken up by axons and also labels other structures, is green; and coracle, a component of septate junctions that labels glia in the Drosophila peripheral nervous system, is red. For more information, see the article by Petley-Ragan et al. (pages 1151–1164).