TAAR1 and hepatitis B virus infection: Tα1 has already been approved for the treatment of Hepatitis B and C in several countries [20], [21].Clinically, Tα1 has been clinically proven to exert an immune modulatory activity on maturation of T cell [22], [23] and the natural killing cell and activation of dendritic cells [24] and the up-regulation of high affinity interleukin-2 receptors [25].