UA, CA, and GA dinucleotides at the polyadenylation [poly(A)] tail sites^a.

aEach of the upstream 100–base messenger (mRNA) sequences (or 3′-untranslated regions) directly adjacent to the poly(A) tail starting position is unique, but all the mapped genomic sites (1.36 sites on average per unique animal or plant mRNA) from a single unique mRNA were counted. The bold numbers mean the frequency of the most frequent dinucleotide at the mapped poly(A) sites. bIf all the multiple copies mapped by a unique mRNA were counted as one unique poly(A) site, the dinucleotide GA was still the most frequent (38.46%) in T. cruzi. cIf all the multiple copies mapped by a unique mRNA were counted as one unique poly(A) site, the dinucleotide CA was still the most frequent (45%) in M. mulatta. dCA: 31.48%; UA: 31.10%.