1. The Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK.
2. Laboratory for Enteric Neuroscience (LENS), Translational Research in GastroIntestinal Disorders (TARGID), Department of Clinical and Experimental Medicine, University of Leuven, Leuven, Belgium.
3. Institute of Food Research, Norwich NR4 7UA, UK.
4. Howard Hughes Medical Institute, Department of Biology, Stanford University, Stanford, CA 94305, USA.
5. Hubrecht Institute–KNAW (Royal Netherlands Academy of Arts and Sciences) and University Medical Centre Utrecht, 3584 CT Utrecht, Netherlands.