^Nagase H, Yamakuni T, Matsuzaki K, Maruyama Y, Kasahara J, Hinohara Y, Kondo S, Mimaki Y, Sashida Y, Tank AW, Fukunaga K, Ohizumi Y. Mechanism of Neurotrophic Action of Nobiletin in PC12D Cells. Biochemistry. 2005, 44 (42): 13683–13691. ISSN 0006-2960. PMID 16229458. doi:10.1021/bi050643x. Nobiletin is a nonpeptide compound with a low molecular weight from a citrus fruit and has the activity to rescue bulbectomy-induced memory impairment