PLOD1 and polycystic ovary syndrome: In addition, another study transplanted feces from healthy women and PCOS patients into two groups of mice bodies and showed that mice transplanted with fecal samples from PCOS patients showed PCOS-like manifestations such as IR, increased number of cystic follicles, and elevated levels of T and luteinizing hormone (LH) compared to control mice (Qi et al., 2019).