ductibility COLLAGEN I NORMAL HUMAN SKIN 3D SKIN BILAYERED EQUIVALENT 3D SKIN THREELAYERED EQUIVALENT COLLAGEN III NORMAL HUMAN SKIN 3D SKIN BILAYERED EQUIVALENT 3D SKIN THREELAYERED EQUIVALENT COLLAGEN V NORMAL HUMAN SKIN 3D SKIN BILAYERED EQUIVALENT 3D SKIN THREELAYERED EQUIVALENT COLLAGEN VI NORMAL HUMAN SKIN 3D SKIN BILAYERED EQUIVALENT 3D SKIN THREELAYERED EQUIVALENT COLLAGEN XV NORMAL HUMAN SKIN 3D SKIN BILAYERED EQUIVALENT 3D SKIN THREELAYERED EQUIVALENT PODOPLANIN NORMAL HUMAN SKIN 3D SKIN BILAYERED EQUIVALENT 3D SKIN THREELAYERED EQUIVALENT