Human inositol hexakisphosphate kinase 2 (IP6K2), also known as IHPK2, InsP6 kinase 2, and PIUS, (GenBank Accession No. NM_016291), a.a. 1-426 (end), with C-terminal FLAG and His-tags, MW=51 kDa, expressed in baculovirus infected Sf9 cells.