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Cover Figure

COVER This week features a Perspective on germline mutations in KRAS, BRAF, and MEK1 and 2 that can lead to specific developmental syndromes. The image shows the pattern of phosphorylated ERK expression in a mouse embryo. [Image: J. Rossant, Toronto Sick Kids Hospital]

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Science Signaling. ISSN 1937-9145 (online), 1945-0877 (print). Pre-2008: Science's STKE. ISSN 1525-8882