FACdb: a comprehensive resource for genes, gut microbiota, and metabolites in farm animals - Zhang, Ze; Li, Yang; Zhang, Di; Chen, Shuai; Lu, Sien; Wang, Kang; Zhou, Miao; Song, Zehe; Li, Qingcui; Yin, Jie; Liu, Xiaoping (Frontiers in Microbiology, 2025)