亚洲精品综合日韩中文字幕网站_精品综合久久久久97_中文在线天堂网www_久久精品免费一区二区三区_91久久国产综合精品女同国语_久久资源总站在线国产成人

CD2, also known as the T-cell surface antigen CD2, is a transmembrane glycoprotein primarily expressed on the surface of T cells and natural killer （NK） cells. It belongs to the immunoglobulin superfamily and plays a crucial role in mediating cell adhesion and activation. CD2's principal ligand is CD58 （LFA-3）, which is expressed on antigen-presenting cells and other immune cells. The interaction between CD2 and CD58 facilitates T-cell activation and enhances the immune response. Structurally, CD2 consists of an extracellular domain responsible for ligand binding, a transmembrane domain anchoring it to the cell membrane, and an intracellular domain involved in signal transduction.