 This domain does not contact RNA, and instead, it recognizes 15 residues sequences that are a part of the PABP interaction motif (PAM-2) found on such proteins as eukaryotic translation termination factor (eRF3) and PABP interacting proteins 1 and 2 (PAIP 1, PAIP2).The structure of human poly(A)-binding protein found in the nucleus (PABPN1) has yet to be well determined but it has been shown to contain a single RRM domain and an arginine rich carboxy terminal domain.They are thought to be structurally and functionally different from poly-A binding proteins found in the cytosol.