SLC6A4 and Anxiety: A case-control study with Italian male and female elite athletes of basketball, soccer and hockey found that the polymorphism 5HTTLPR SS genotype of the Solute Carrier Family 6 Member 4 (SLC6A4) was associated with neuroticism (p < 0.001) and adverse sport-related stress, namely tension/anxiety symptoms (p < 0.02), cognitive anxiety and emotional arousal control (p < 0.01) [7].