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We show here that a secreted EGF-Discoidin-domain protein, Xenopus Del1 (xDel1), is an essential factor for dorsal development in the early Xenopus embryo. Knockdown of the xDel1 function causes obvious ventralization of the embryo. Conversely, overexpression of xDel1 expands dorsal-marker expression and suppresses ventral-marker expression in the gastrula embryo. Forced expression of xDel1 dorsalizes...
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