DNA encoding IL-1 delta polypeptides and methods for using the DNA and encoded polypeptides are disclosed. The energy absorber having a planar wall connecting portion, a planar closure connecting portion and a plastically deformable deforming surface therebetween. CompositionA silicone compound represented by the general formula : R1aR2bR3cSiO2 : R4CO2QR4 is a saturated or unsaturated hydrocarbon group having 2-30 carbon atoms, Q is a bivalent hydrocarbon group which may also contain a hetero atom, a is 1. 20 or more, reacting the resultant reaction mixture with the following compounds and at a temperature of 120\xb0 C. The thickness of the etching stopper layer varies among the light-emitting elements.