Cover legend: In situ hybridization images of the neonate common marmoset brain for FoxP2, Btbd3, EphA6 (top row from left to right), FoxP2, EphA6, Cdh8 (second row from left to right), and EphA4, Cplx3, Relin (bottom row from left to right), respectively. For more information, see the article by Mashiko et al. (pages 5039–5053).