Cover image: The genetic code is the fundamental alphabet of life. This code, once thought to be universal and the same for all forms of life, shows a few enigmatic deviations between different species, e.g., bees and feather stars. One of those anomalies may be a primordial adaptation to aerobic respiration and oxidative stress, which results in a high concentration of methionine within the mitochondria. See the article by Aline Bender et al. on pages 16496–16501. Artwork courtesy of Michael Plenikowski (University of Mainz, Mainz, Germany).