title: Authors' reply to Mawer and Wilcox and Mullish and Williams.
authors.affiliation: Department of Twin Research and Genetic Epidemiology, King's College London, London SE1 7EH, UK tim.spector@kcl.ac.uk.
authors.forename: Tim
authors.initials: T
authors.lastname: Spector
authors.affiliation: Departments of Pediatrics and Computer Science and Engineering, University of California San Diego, USA.
authors.forename: Rob
authors.initials: R
authors.lastname: Knight
mesh_terms: D003013:Clostridium / Q000302:isolation & purification*; D003015:Clostridium Infections / Q000628:therapy*; D003106:Colon / Q000382:microbiology*; D000069467:Fecal Microbiota Transplantation; D006801:Humans; D064307:Microbiota