UASt regulatory sequences drive expression of a VHH intrabody ('3E9') that has been shown previously to bind Hsap\PABPN1 (epitope maps within the 155 N-terminal amino acid residues) (PMID:16319127). The coding sequence is tagged at the N-terminal end with a Tag:NLS(SV40-largeT) nuclear localization signal and at the C-terminal end with both Tag:MYC and Tag:polyHis.