nonhuman 105 Article 95 controlled study 64 human 27 RNA 16S 26 microbial community 25 microbiome 23 metagenomics 22 article 17 microbial diversity 17 Microbiome 16 bacterial strain 16 intestine flora 16 gene expression 15 unclassified drug 15 antibiotic resistance 14 bacterial gene 14 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