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About the Cover
Cover: The annelid worm Pristinella osborni reproducing by paratomic fission. Worms intercalate a new head and tail in the middle of their bodies, forming a transiently linked chain of individuals. This particular worm is at a late stage of fission, and possesses two fully formed heads: one at the anterior end (upper left) and one in the middle of its body (lower left). Expression of engrailed- and orthodenticle-class genes suggests that this peculiar mode of reproduction evolved by recruitment of regenerative and embryonic processes. For further details, see the article by A. E. Bely and G. A. Wray in this issue, Development 128, 2781-2791.
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