Platycodin D and D3 isolated from the root of Platycodon grandiflorum modulate the production of nitric oxide and secretion of TNF-α in activated RAW 264.7 cells - Wang, C; Schuller Levis, G B; Lee, E B; Levis, W R; Lee, D W; Kim, B S; Park, S Y; Park, E (Int Immunopharmacol, 2004)