By Ryan Scheiderer, Saud Abdul Aziz Faculty Mentor: Dr. Laura Sipe Abstract Serotonin (5-HT) is a neurotransmitter and hormone involved in immune regulation. This study examines inflammatory modulation by exposure of RAW264.7 macrophages. At 10-5 M, serotonin significantly reduced inflammatory markers. An MTT assay revealed reduced cell viability across all conditions, thus necessitating the normalization…