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About the Cover
Cover: Ten notochord precursors in Ciona gastrula embryos express Brachyury. Specification of two of these precursors, which generate caudal notochord cells, depends on localised Nodal and Delta2 signalling sources. Top, control embryo; middle, unilateral ablation of the Nodal- or Delta2-expressing cells; bottom, inhibition of Delta2/Notch signalling. See article by Hudson and Yasuo on p. 2855.
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