Ursolic acid from the Chinese herb danshen (Salvia miltiorrhiza L.) upregulates eNOS and downregulates Nox4 expression in human endothelial cells. - Steinkamp-Fenske,K.; Bollinger,L.; Voller,N.; Xua,H.; Yao,Y.; Bauer,R.; Förstermann,U.; Li,H. (Atherosclerosis, 2007)