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Cover legend: Intratelencephalic projection neurons (IT-PNs, red retrograde label) in mouse motor cortex express different proteins implicated in molecular control of neuron phenotype. The transcription factor Fezf2 (green transgenic GFP label) is expressed specifically by IT-PNs in layer 5A (red + green = yellow neurons), whereas, Cux1 protein (blue immunostain) is specific to layer 2/3 IT-PNs (red + blue). The dendritic reconstructions of Fezf2-positive IT-PNs are superimposed in gray to illustrate their unique morphology. For more information, see the article by Tantirigama et al. (pages 4303–4308).