attributes.tag: host
attributes.value: Homo sapiens
attributes.tag: collection_date
attributes.value: 2014-11-04
attributes.tag: geo_loc_name
attributes.value: Spain
attributes.tag: lat_lon
attributes.value: 41.997742 N 2.820006 E
attributes.tag: ref_biomaterial
attributes.value: Metformin alters gut microbiota structure and function in treatment-naive type 2 diabetes patients
attributes.tag: samp_size
attributes.value: 131
attributes.tag: BioSampleModel
attributes.value: Metagenome or environmental