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