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. 2014 Nov 7;5:51. doi: 10.1186/2049-1891-5-51

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© Geisert et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Morphological stages of early conceptus development between Days 10 to 12 of pregnancy. Upon reaching a spherical diameter of appropriately 10 mm, conceptuses rapidly transition to ovoid, tubular and filamentous morphologies within 2 to 3 hours.