Summary: Cat.No. : BTD-355H Product Overview : Recombinant Human BTD (P43251) (Met1-Asp543), fused with a C-terminal polyhistidine tag, was produced in Human Cells. Source : Human Cells Species : Human Tag : His Predicted N Terminal : Ala 42 Form : Lyophilized from sterile PBS, pH 7.4.Normally 5 % - 8 % trehalose and mannitol are added as protectants before lyophilization.