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Cover legend: Area-specific expression pattern of the transcriptional regulator Lmo4 in the developing mouse cortex. Area-patterning genes that are expressed during mitotic stages of cortical development generally have graded expression across cortical areas. In contrast, Lmo4 is expressed in postmitotic neurons, and exhibits area-specific expression that sharply delineates cortical regions. Lmo4 expression is highest along the midline, corresponding to cingulate, rostral motor, and retrosplenial cortex. Lmo4 expression is weaker in regions that flank the midline, and is absent in the most lateral regions. For more information, see the article by Cederquist et al. (pages 6321–6332).