1. Memory Mechanisms: A common cascade for long-term memory
Yukiko Goda 
Current Biology 
Volume 5, Issue 2, Pages (February 1995)
DOI: /S (95)

2. Figure 1
Production of cAMP by adenylate cyclase activates PKA. To establish long-term memory, the active catalytic subunit of PKA travels back to the nucleus where it phosphorylates CREB; CREB dimers subsequently promote transcription of genes through CRE sequences. The site of PKA activation required for long-term memory, whether presynaptic or postsynaptic, is not yet known.
Current Biology 1995 5, DOI: ( /S (95) )