Description_x000D_ General description_x000D_ SILu™ Prot VEGF165 is a recombinant, stable isotope-labeled human VEGF165 which incorporates [13C6,15N4]−Arginine and [13C6, 15N2]−Lysine. Expressed in human 293 cells, it is designed to be used as an internal standard for bioanalysis of VEGF165 by mass-spectrometry._x000D_ Suggested Quantitative Analysis Parameters_x000D_ (MRM settings provided for three suggested peptides)_x000D_ Biochem/physiol Actions_x000D_ VEGF165 belongs to the PDGF/VEGF growth factor family characterized by the presence of eight conserved cysteine residues and a cystine knot structure1. VEGF is secreted by the majority of tumor cells and initiates angiogenesis by activating endothelial cells of existing blood vessels and promoting their migration2._x000D_ VEGF has also been implicated in correlation with poor prognosis in breast cancer2. In addition, VEGF is released in rheumatoid arthritis in response to TNF-α, increasing endothelial permeability and stimulating angiogenesis (formation of capillaries)3,4._x000D_ Sequence_x000D_ APMAEGGGQNHHEVVKFMDVYQRSYCHPIETLVDIFQEYPDEIEYIFKPSCVPLMRCGGC_x000D_ Physical form_x000D_ Supplied as a lyophilized powder containing phosphate buffered saline_x000D_ Legal Information_x000D_ This product is licensed under U.S. Patent No. 7,396,688 and foreign counterparts from E. I. du Pont de Nemours and Company. The purchase of this product conveys to the buyer the nontransferable right to use the purchased amount of the product for research and development only, including services for a third party for consideration. The buyer cannot sell or otherwise transfer this product, its components or materials made using this product or its components to a third party. Information about licenses for excluded uses is available from: E. I. du Pont de Nemours and Company; Attn: Associate Director, Commercial Development; DuPont Experimental Station E268; 200 Powdermill Rd.; Wilmington, DE 19803; 1-877-881-9787 (voice),1-302-695-1437 (fax), licensing@dupont.com._x000D_ SILu is a trademark of Sigma-Aldrich Co. LLC