1.1.2.4　Matrix

The matrix is an amorphous substance.The main components are proteoglycans，glycoproteins，and glycosaminoglycans.They exist in the spaces between fibers and fiber bundles and between cells，and are rarely found in normal skin.Proteoglycan and glycosaminoglycan complexes have strong water absorption and play an important role in regulating bound water and dermal plasticity.The matrix is involved in the connection of cell components and fiber components，affecting cell proliferation and differentiation，tissue repair，and structural reconstruction.(https://www.daowen.com)