Luteolin protects rat PC12 and C6 cells against MPP+ induced toxicity via an ERK dependent Keap1-Nrf2-ARE pathway - Wruck, C J; Claussen, M; Fuhrmann, G; Römer, L; Schulz, A; Pufe, T; Waetzig, V; Peipp, M; Herdegen, T; Götz, M E (J Neural Transm Suppl, 2007)