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NF stage 32, Xenopus laevis embryo, drawn from brightfield microscopy, anterior view, dorsal up. This illustration is published under the terms of the Creative Commons Attribution-NonCommercial License (, which permits non-commercial copy, adaptation, distribution and reproduction in any medium provided that the original work is properly attributed. When reproducing or referring to these drawings, please cite: Zahn, N., Levin, M. and Adams, D. S. (2017). The Zahn drawings: new illustrations of Xenopus embryo and tadpole stages for studies of craniofacial development. Development 144(15), 2708-2713. doi:10.1242/dev.151308

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