The invention provides a human new glutathione S-transferase and polynucleotides which identify and encode GSTS. An exclusive-OR operation circuit uses an error amount detected by error correction in the first direction and data stored in a storage element to calculate a first error check result. Supported on the mirror base is a mirror head with a bracket that can be folded about one axis in the direction of travel and one axis opposite the direction of travel. A spring unit is also provided on the body and includes a spring serving to self-center and bias the ball into the track. The exit air housing is positioned behind the first vacuum fan housing and the second fan vacuum fan housing.