Vascular Endothelial Growth Factor-A (VEGF-A) was originally isolated from tumor cells and is produced by a wide variety of cell types. In addition to stimulating vascular growth and vascular permeability, VEGF-A may play a role in stimulating vasodilatation via nitric oxide-dependent pathways. VEGF-A has several variants, VEGF-165 being the most abundant. and bovine VEGF are one amino acid shorter than the factor, and the bovine and sequences show a homology of 95%. Recombinant VEGF-165 is a disulfide linked homodimer, containing two 165 amino acids chains, with a total molecular weight of 38.8 kDa.
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