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. 2015 Apr 10;10(4):e0119547. doi: 10.1371/journal.pone.0119547

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Fig 3 — (A) Pregnant uterus on GD6. Gestational sacs of 1.8mm–2.7mm were observed in the proximity of the abdominal surface without visible signs of an embryo. (B) Pregnant uterus on GD7. Advanced endometrial reaction and the presence of an embryo were visible in the gestational sacs. (C) Non-pregnant uterus of a mouse seven days after mating, equivalent to GD7. (D) The pie chart shows that pregnancy could be diagnosed in 32 (white) of the 35 mice with high-frequency ultrasound on GD7. Of three mice diagnosed as non-pregnant on GD7 (shading), two were non-pregnant (grey shading), while one carried a pregnancy to term (white shading).