Corrigendum: Commensal bacteria make GPCR ligands that mimic human signalling molecules

Nature 549, 48–53 (2017); doi:10.1038/nature23874 In this Article, the description in the Methods of the human stool samples used for the analysis presented in Extended Data Fig. 9 was incomplete. All samples were collected with informed consent under protocol numbers 09-067, 09-141 and 06-107 at Memorial Sloan Kettering Cancer Center (MSKCC) and stored as part of a biospecimen repository.