Summary: Cat.No. : Spn-50R Product Overview : Recombinant Rat Spn (NP_001258015.1) (Met1-Gly243), fused with the Fc region of human IgG1 at the C-terminus, was produced in Human Cells. Source : Human Cells Species : Rat Tag : Fc Predicted N Terminal : Glu 20 Form : Lyophilized from sterile PBS, pH 7.4.Normally 5 % - 8 % trehalose and mannitol are added as protectants before lyophilization.