Vascular Cell Adhesion Molecule-1 (VCAM-1) is a cell surface sialoglycoprotein expressed by cytokine activated endothelium. The protein has a number of functions including the regulation of leukocyte migration, leukocyte-endothelial cell adhesion and signal transduction, and plays a role in a number of inflammatory diseases. Recombinant VCAM-1 comprises a 674 amino acid fragment (25-698) corresponding to the mature extracellular VCAM-1 protein and is expressed in E. coli with an amino-terminal hexahistidine tag.