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About the Cover
Cover: In the ascidian Ciona intestinalis, ubiquitous maternal GATAa activity (green) becomes restricted to the animal ectoderm by the 16-cell stage, through accumulating 
-catenin in vegetal blastomeres (purple). GATAa subsequently determines animal neural tissue and epidermis. See research article by Rothbächer et al. on p. 4023.
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