Nectin-2 belongs to a family of immunoglobulin-like cell adhesion molecules that are characterized by the presence of three immunoglobulin-like domains (V, C2 and C2) in the extracellular region. The V domain plays important roles in cell adhesion, NK cell activation and the entry of some herpesvirus. In this study, the V domain of human nectin-2 was expressed in Escherichia coli in the form of inclusion bodies, which were subsequently denatured and refolded. The soluble protein was crystallized using the hanging-drop vapour-diffusion method. The crystals diffracted to 1.85 A resolution and belonged to space group P2(1), with unit-cell parameters a = 52.3, b = 43.9, c = 56.1 A, beta = 118.2 degrees .