Effects of mitragynine on cAMP formation mediated by delta-opiate receptors in NG108-15 cells - Tohda, M; Thongpraditchote, S; Matsumoto, K; Murakami, Y; Sakai, S; Aimi, N; Takayama, H; Tongroach, P; Watanabe, H (Biol Pharm Bull, 1997)