Read our latest publication “Neurochemically and Hodologically Distinct Ascending VGLUT3 versus Serotonin Subsystems Comprise the r2-Pet1 Median Raphe,” now available in the Journal of Neuroscience. We describe “sister” Pet1 lineages, one serotonergic and the other largely glutamatergic, with the latter forming exquisite presynaptic structures called pericellular baskets in the septum,