V-set and immunoglobulin domain-containing protein 2 (VSIG2) is also known as Cortical thymocyte-like protein, CTH, CTXL, is a single-pass type I membrane protein which contains Ig-like C2-type (immunoglobulin-like) domain and one Ig-like V-type (immunoglobulin-like) domain. V-set domains are Ig-like domains resembling the antibody variable domain. VSIG2 is highly expressed in stomach, colon, prostate, trachea and thyroid glands and weakly in bladder and lung. V-set domains are found in diverse protein families, including immunoglobulin light and heavy chains.