Human SERPINB4 Recombinant Protein (N-His) is a recombinant protein expressed in E. coli, spanning Lys19-Val148, with an N-terminal His tag. Purity: >90% as determined by SDS-PAGE. Supplied lyophilized from a solution in PBS pH 7.4, 1 mM EDTA, 4% Trehalose, 1% Mannitol. Applications: ELISA, immunogen, SDS-PAGE and Western blot. Serpin B4 is a ~44 kDa protein. May act as a protease inhibitor to modulate the host immune response against tumor cells. For research use only.