HTR2A and concussion: The ability of serotonin signaling dependent on the 5-HT2A receptor to modulate social function and mood across both injury- and genetic-derived models of altered social behavior underscores the capacity and robustness of the 5-HT2A receptor as a target for investigation, and suggests that pharmacological interrogation of dysregulated 5-HT2A signaling may be beneficial in the context of mTBI.