One of the variations is made up of two short strands, which is fairly rare, but people with that genetic hand process serotonin badly, magnifying their risk of depression and anxiety. Another version contains a long and a short strand, which means better, but still inefficient, serotonin use. The third variant contains two long strands, which allows for the best use of the hormone. The people with that variant, scientists believe, are more naturally resilient, which is a key criterion for confidence.
