The nature of the early RNA response was analyzed by polyacrylamide gel electrophoresis. The extraction procedure allowed quantitative isolation of undegraded RNA from whole mouse skin. By 3 hr after treatment with effective tumor promoters, there was a large stimulation of incorporation of cytidine-3H into "32 S" RNA, rRNA, and 4 to 5 S RNA. Stimulation of cytidine-3 H incorporation into 32 S ...