Cover legend: Cryosection of the olfactory bulb of a OMPtaugfp transgenic mouse showing projections from mature olfactory sensory neurons. Overlay, A pair of electroolfactogram (EOG) traces recorded from a mouse maintained on a control diet (left) versus one maintained on a high-fat diet (right). Obesity affects olfactory structure and function. For more information, see the article by Thiebaud et al. in issue 20 (pages 6970–6984).