The process of consolidating a new memory and the dynamic complexity of information processing within neuronal networks is greatly increased by activity-dependent changes in gene expression within individual neurons. A leading paradigm of such regulation is the activation of the nuclear transcription factor CREB (cAMP Responsive Element Binding Protein), and its family members the ATF (Activating Transcription Factor) and CREM (cAMP Response Element Modulator), which belong to bZIP (basic/leucine zipper) class of transcription factors that functions in vivo to regulate the proliferation of pituitary cells and thymocytes...