In vitro serotonergic activity of black cohosh and identification of N(omega)-methylserotonin as a potential active constituent - Powell, S L; Godecke, T; Nikolic, D; Chen, S N; Ahn, S; Dietz, B; Farnsworth, N R; van Breemen, R B; Lankin, D C; Pauli, G F; Bolton, J L (J Agric Food Chem, 2008)