Human elastase IV polypeptides and DNA encoding such polypeptides and a procedure for producing such polypeptide by recombinant techniques and utilizing such polypeptide for therapeutic purposes, for example, restoration of elasticity of arterial walls, improvement of serum lipid abnormality and improvement of serum lipoprotein metabolism are disclosed. A proximal panel is connected to the base by a spring-loaded hinge and has an image display area. The insulating material may be any suitable material including and not limited to one or a combination of materials such as BPSG, PSG, silicon dioxide and silicon nitride.