In vivo estrogenic comparisons of Trifolium pratense (red clover),Humulus lupulus (hops), and the pure compounds isoxanthohumol and 8-prenylnaringenin - Overk, C R; Guo, J; Chadwick, L R; Lantvit, D D; Minassi, A; Appendino, G; Chen, S N; Lankin, D C; Farnsworth, N R; Pauli, G F; van Breemen, R B; Bolton, J L (Chem Biol Interact, 2008)