PolyAdenylation is the result of an RNA processing reaction, where a multiprotein complex assembles on specific sequences on the pre-mRNAs, called the cleavage and polyadenylation signals (pA signals).The classic pA signal is a bipartite sequence element that usually consists of a PAS hexamer, upstream motifs and downstream motifs of the cleavage site.

On this page, users can query these APA motifs near polyadenylation sites (PAS) of each species.