The levels of TSPO paralleled the levels of one of the NADPH oxidase subunits (gp91phox) in neutrophils from two types of chronic granulomatous disease patients, one with a deficiency in gp91phox and decreased TSPO and the other with normal levels of both proteins (Zavala et al. 1990). The gene discussed is CYBB; the disease is chronic granulomatous disease.