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Cover Figure

ONLINE COVER This week's issue features a Perspective discussing the transcription factors and signaling molecules that prevent the induction of extra rows of teeth in mice. The image depicts the multiple rows of teeth in the jaw of a mako shark (Isurus oxyrinchus). [Image: iStock]

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