Larger Image smad1 (SMAD family member 1) gene expression in Xenopus laevis embryo, assayed via in situ hybridization, NF stage 26, lateral view, anterior left, dorsal up. This image is extracted from figure published in: Thomsen GH (1996), Image published in: Thomsen GH (1996) Copyright © 1996. 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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