The proteins that constitute these complexes are recruited to the cleavage site by cleavage and polyadenylation specificity factor and cleavage stimulatory factor, and form a larger complex that also includes polyadenine polymerase, which performs the polyadenylation reaction.
Proteins involved in this process are recruited to the cleavage site by two factors: cleavage and polyadenylation specificity factor and cleavage stimulatory factor. These proteins then form a larger complex with polyadenine polymerase, which carries out the polyadenylation reaction.