Problem
A 16-year-old female patient comes to the office with complaints of unwelcome, persistent thoughts affecting her school work. Every day, she checks the locks at home excessively to the point it makes her late for school. She feels a need for order or symmetry in her room, as she will feel "not right" if everything is not where she thinks it is supposed to be. What neurotransmitters may be unbalanced in this patient?