title: Reply.
authors.affiliation: Department of Gastroenterology & Hepatology, Academic Medical Center, Amsterdam, The Netherlands.
authors.forename: Cyriel
authors.initials: C
authors.lastname: Ponsioen
authors.affiliation: Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands.
authors.forename: Erwin
authors.initials: E
authors.lastname: Zoetendal
authors.affiliation: Department of Gastroenterology & Hepatology, Academic Medical Center, Amsterdam, The Netherlands.
authors.forename: Noortje
authors.initials: N
authors.lastname: Rossen
authors.affiliation: Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands.
authors.forename: Susana
authors.initials: S
authors.lastname: Fuentes
authors.affiliation: Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands.
authors.forename: Willem
authors.initials: W
authors.lastname: de Vos
mesh_terms: D001691:Biological Therapy / Q000379:methods*; D003093:Colitis, Ulcerative / Q000628:therapy*; D005243:Feces / Q000382:microbiology*; D005260:Female; D006801:Humans; D008297:Male; D064307:Microbiota