EXTL2 (Exostosin-Like Glycosyltransferase 2) is a gene that encodes an enzyme involved in producing heparan sulfate, a crucial component of the extracellular matrix. Heparan sulfate interacts with various growth factors and signaling molecules, playing key roles in cell proliferation, adhesion, and differentiation. EXTL2’s role in heparan sulfate synthesis highlights its significance in development and maintaining tissue health.