2.1 A crystal structure of human PXR in complex with the St. Johnʼs wort compound hyperforin - Watkins, R E; Maglich, J M; Moore, L B; Wisely, G B; Noble, S M; Davis-Searles, P R; Lambert, M H; Kliewer, S A; Redinbo, M R (Biochemistry, 2003)