Effects of Mitragynine and its Derivatives on Human Opioid Receptors (Delta, Kappa, and Mu) - Dale, O; Ma, G; Gemelli, C; Husni, A; McCurdy, C; Avery, BA; Leon, JF; Furr, EB; Manly, SP; Cutler, S (Planta Medica, 2012)