Larger Image Confocal immunoflurescence of Nkx2-1 AB1 (green) staining trachea and lung buds/lung primordia, along with Sox2 AB1 (red) staining stomach and esophagus, in a NF stage 42 X. laevis embryo. This image is extracted from figure published in: Rankin SA et al. (2012), Image published in: Rankin SA et al. (2012) Copyright © 2012. 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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