Human Double-stranded RNA-binding protein Staufen homolog 1 with truncated RNA-binding domain 2 and truncated RNA-binding domain 3 and truncated Staufen-swapping (ΔSSM) motif. Construct has truncated SSM motif - residues 454-488 in the UniProt sequence O95793 in addition to four non-native amino acids at the N-terminus (GSHM).