1. M H Vaughan, et al. Differential sensitivity of human normal and malignant cells to 8-azahypoxanthine in vitro. Exp Cell Res. 1971, 69, 1. 2. Bennett LL Jr, et al. Studies with 8-azainosine, a cytotoxic nucleoside with antitumor activity. Cancer Res. 1973 Mar;33(3):465-71.