For example, chronic granulomatous disease (CGD) is caused by the chimeric form of NCF1 (neutrophil cytosolic factor 1) and its pseudogenes NCF1B (neutrophil cytosolic factor 1B pseudogene) and NCF1C (neutrophil cytosolic factor 1C pseudogene) [26]. Here, NCF1B is linked to chronic granulomatous disease.