Effective small interfering RNAs and phosphorothioate antisense DNAs have different preferences for target sites in the luciferase mRNAs - Yunhe Xu; Hong-Yan Zhang; Dorit Thormeyer; Ola Larsson; Quan Du; Joacim Elmén; Claes Wahlestedt; Zicai Liang (Biochemical and Biophysical Research Communications, 2003)