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Cover legend: Expression of phosphorylated glycogen synthetase kinase 3 (GSK3; red) and β-tubulin (blue) in the CA1 region of a rat hippocampal slice in which late-LTP was induced. Synaptic stimulation that induces late-LTP also leads to the inhibitory phosphorylation of GSK3 in the apical dendrites of these neurons, an event that regulates the activity of mammalian target of rapamycin. For more information, see the article by Ma et al. in this issue (pages 17537–17546).