As a chemistry graduate student, I feel that I may be the needle in a haystack at SfN. I study the global metabolomics of brain chemistry. Currently, I have detected over 100 compounds from homogenized tissue and ~60 compounds from dialysate. Since my research isn’t focused on studying a single metabolite, I wanted to hear from the SfN community about their favorite neurotransmitter/modulator and why? Please include specifics about the molecules function within the brain, and to what region of the brain. Look forward to your responses.