Bmal1 deletion alters relative abundances at genus level in fecal microbiota in mice. The relative abundances at genus level in WT mice (blue) and Bmal1 KO mice (red). The relative abundance of Bacteroidales spp., Rikenellaceae spp., F16 spp., Clostidiales spp., Clostridiaceae spp., Rikenella, Peptococaceae spp., and Ureaplasma were increased in Bmal1 KO mice. The relative abundance of S24-7 spp., Helicobacter, Allobaculum, Prevotella, Lactobacillaceae spp., and Sutterella were decreased in Bmal1 KO mice. NWT = 5, NBmal1 KO = 6. Mean ± SEM shown. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001 by Mann–Whitney test. All remained significant when adjusted to control for a false positive rate of 5%.