Cover legend: Neuromuscular junction staining of a postnatal day 9 mouse splenioius capitis, a muscle affected in spinal muscular atrophy (SMA). Acetylcholine receptors, labeled with α-bungarotoxin, are shown in red. Neurofilament/Synaptic Vesicle 2 are shown in green. For more information, see Miller et al. (pages 6038–6050).