Lewis X tetrasaccharide

LX4; Lewis x (Lex) tetraose

Lewis X tetrasaccharide (also known as LeX) is a specific carbohydrate epitope consisting of a tetrasaccharide structure. It is a key blood group antigen found on the surface of various cells. Lewis X is a crucial ligand for selectins, a family of adhesion proteins that mediate the rolling of immune cells to sites of inflammation.