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Cover Figure

COVER This week features a Perspective on erythropoietin (Epo) signaling and the possibility that Epo may promote the growth of cancer cells. The image depicts two possible forms of the Epo receptor (a homodimer and a heterodimer) that may mediate Epo signaling in cancer cells. [Image: Preston Huey, AAAS]

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