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. 2017 Oct 16;8:268. doi: 10.3389/fendo.2017.00268

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Copyright © 2017 Cui, Wang, Zhao, Zhang, Xu, Yang and Hao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The expressions of the endocannabinoid system and leukemia inhibitory factor (LIF) of the two groups. (A) The HE staining of the endometrium tissue of the patients in the two groups. (B,C) The levels of CB1 (B), fatty acid amide hydrolase (FAAH) (C), and LIF (D) of the patients in the unexplained infertility (UI) and control groups were measured by immunohistochemical staining. (E) The integral optical density (IOD) values of CB1, FAAH, and LIF of UI group (n = 28) and control group (n = 32). The expressions of FAAH and LIF of UI group were significantly lower than the control group. The experiments were repeated three times. The results were presented as mean. The significance of the variation was summarized in Table 5. *P < 0.05.