A system and method is described for identifying T cell and other epitopes and the like. The optical power at the first recording speed is calculated based on a reference optical power and a measured optical power, and the predetermined value may correspond to the maximum allowable power of a laser pickup. A light-emitting diode is embedded within the light transmissive bar for illuminating the ruled markings. Brackets with more than one channel have support rods connecting their channels and holding them in spaced apart arrangement. A pants hem is tucked behind the clip insert and keeps the hem above the shoe heel. The difference for each color component between each pixel in the detection window and the reference color is calculated.