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The nucleoprotein structure of the mouse mammary tumor virus (MMTV) promoter defines its response to cAMP signaling. A stably replicating MMTV template in highly organized chromatin is repressed in the presence of cAMP, whereas a transiently transfected template with a disorganized structure is activated. In this study, we investigate the nature of the cAMP-induced signal(s) by which these opposing...