3'-exoribonuclease that has a preference for poly(A) tails of mRNAs, thereby efficiently degrading poly(A) tails. Exonucleolytic degradation of the poly(A) tail is often the first step in the decay of eukaryotic mRNAs. Required during meiotic maturation to silence certain maternal mRNAs translationally. Does not require an adenosine residue at the 3' end, however, the addition of 25 non-adenylate residues at the 3' terminus, or a 3' terminal phosphate is inhibitory. Involved in dormant mRNAs regulation during oocyte maturation by counteracting polyadenylation mediated by papd4/gld2nt in immature eggs. During maturation it is excluded from the ribonucleoprotein complex, allowing poly(A) elongation by papd4/gld2nt and activation of mRNAs. Exonucleolytic cleavage of poly(A) to 5'-AMP. Component of a complex at least composed of cpeb1, cpsf1, papd4/gld2, pabpc1/ePAB, parn and sympk. In retina, it is constitutively present in most retinal cells, including the photoreceptors. Expressed throughout early development. A 62 kDa form, which is produced by proteolytic cleavage, also exists. Belongs to the CAF1 family. Contaminating sequence. Potential poly-A sequence.