Gut bacteria-derived 5-hydroxyindole is a potent stimulant of intestinal motility via its action on L-type calcium channels. - Waclawiková, Barbora; Bullock, Amber; Schwalbe, Markus; Aranzamendi, Carmen; Nelemans, Sieger A.; van Dijk, Gertjan; EL Aidy, Sahar (PLoS Biology, 2021)