nonhuman 104 Article 94 controlled study 64 human 27 RNA 16S 25 microbial community 25 microbiome 23 metagenomics 22 article 17 microbial diversity 17 Microbiome 16 intestine flora 16 bacterial strain 15 gene expression 15 unclassified drug 15 antibiotic resistance 14 bacterial gene 13 female 13 Escherichia coli 12 Metagenomics 12 amplicon 12 bacterial genome 12 male 12 adult 11 bacterium isolate 11 gene sequence 11 gene cluster 10 metabolomics 10 metagenome 10 Metabolomics 9