Members of this family are found in Dictyostelium STAT proteins and adopt a structure consisting of four long alpha-helices, folded into a coiled coil. They are responsible for nuclear export of the protein [1].

1: Structure of an activated Dictyostelium STAT in its DNA-unbound form. Soler-Lopez M, Petosa C, Fukuzawa M, Ravelli R, Williams JG, Muller CW; Mol Cell. 2004;13:791-804. PMID:15053873