KMO and polycystic ovary syndrome: However, only 3‐HAA and 5‐HT exhibited consistent changes between donor and recipient mice (Figure 3E–G; Figure S3G, Supporting Information), which aligns with prior findings that KYNU and KMO in the KP pathway may be microbially encoded.[33] Similarly, we further confirmed that serum 3‐HAA levels were decreased in PCOS patients and P‐FMT mice compared with healthy individuals and H‐FMT mice, respectively (Figure 3H).