Larger Image nodal1 (nodal homolog 1) gene expression in Xenopus laevis embryo, assayed via in situ hybridization, NF stage 27, dorsal view, anterior up. Image published in: Onuma Y et al. (2006) Copyright © 2006. Image reproduced with permission of the Publisher and the copyright holder. This is an Open Access article distributed under the terms of the Creative Commons Attribution License.
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