The majority of eukaryotic mRNAs contain a tract of A residues at the end. These polyA-tails are not encoded in the DNA. Rather, they are added to the pre-mRNA "post-transcriptionally" (after transcription). The end of pre-mRNA is cut by a specific enzyme
CAMP response element-binding protein 2(CREB2) is also known as Activating Transcription Factor 2 (ATF2). CREB2 is a CREB repressor, which means it inhibits long-term memory formation.
The serine/threonine protein phosphatase 2A catalytic subunit alpha (PP2A, also known as A0132), is an isoform of the catalytic subunit of the serine/threonine phosphatase (PP2) and belongs to the PPP family of protein phosphatases, PP1 subfamily.