細胞色素b由輕鏈（α）和重鏈（β）組成該基因編碼光，α亞基，已經提出作為吞噬細胞的殺微生物氧化酶系統的主要成分。該基因的突變與常染色體隱性遺傳性慢性肉芽腫性疾病（CGD）有關，其特征在于活化的吞噬細胞的失敗產生超氧化物，這對于這些細胞的殺微生物活性是重要的。[由RefSeq提供，2008年7月]
Cytochrome b is comprised of a light chain (alpha) and a heavy chain (beta). This gene encodes the light, alpha subunit which has been proposed as a primary component of the microbicidal oxidase system of phagocytes. Mutations in this gene are associated with autosomal recessive chronic granulomatous disease (CGD), that is characterized by the failure of activated phagocytes to generate superoxide, which is important for the microbicidal activity of these cells. [provided by RefSeq, Jul 2008]