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"Researchers from Peking University (China), National Clinical Research Center for Obstetrics and Gynecology (China), National Institutes of Health (USA) and The Pennsylvania State University (USA) have shown that humanized mice receiving a fecal transplant from women with PCOS developed ovarian dysfunction, along with immune changes and insulin resistance."

https://www.gutmicrobiotaforhealth.com/en/the-gut-microbiota-may-be-involved-in-ovarian-dysfunction-and-insulin-resistance-in-polycystic-ovary-syndrome/