CD79A and attention deficit-hyperactivity disorder: Bacteroides ovatus was identified as the species that principally promoted the production of gut secretory IgA and maintained gut homeostasis.42Bacteroides ovatus was also found to consume gut tryptophan and produce indole-3-acetic acid, an important tryptophan metabolite,43 which drives hippocampal neurogenesis in adult mice.44 Therefore, we next wondered whether exogenous Bacteroides ovatus supplementation could affect brain function and ADHD-like behaviors in SHRs.