1696. It's DNA all the way: Colburn, N. H. & Boutwell, R. K. (1968). The in vivo binding of β-propiolactone to mouse skin DNA, RNA and protein. Cancer Res. 28, 642 Colburn, N. H. & Boutwell, R. K. (1968). The binding of β-propiolactone and some related alkylating agents to DNA, RNA, and protein of mouse skin; relation between tumor-initiating power of alkylating agents and their binding to DNA. Cancer Res. 28, 653