Hosts: Vincent Racaniello, Michael Schmidt, Elio Schaechter and Michele Swanson. 
The TWiM team discusses evidence that serotonin synthesis is regulated by spore-forming members of the gut microbiota.
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Links for this episode

When antibiotic resistance in vitro falls short (STC)
Gut microbiota control serotonin in mice (Cell)
Serotonin biosynthesis (Wikipedia)
Microbial endocrinology (STC)
Image credit
Sponsors for this episode: SciMedSolutions, Jmbe.asm.org, ICAAC-ICC

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Image: Serotonin temporary tattoo by flickr user: ChezShawna