In a rack and pinion type steering apparatus whose housing includes a pinion accommodating portion, a rack accommodating portion, a radial opening defining a rack guide hole, and a projecting portion which is formed on the side of the rack accommodating portion opposite the rack guide hole. The present invention further provides methods for decreasing the level of circulating TNF in a subject. This method determines the optimal pixel pitch and mirror tilt angle for a given incident angle and wavelength of near monochromatic spatially coherent light to assure blazed operating conditions. The first and second winding turns are offset from each other along both of the width and length of the magnetic core. The intensity of the light when the subject experiences discomfort can be recorded. The method includes displaying in a first GUI area a representation of a first modification that was previously applied to the knowledge entity, displaying in the first GUI area a representation of a first version of a second modification that was previously applied to the knowledge entity, and receiving user input specifying a change to the first version of the second modification.