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bluebird bio, Inc., a biotechnology company, researches, develops, and commercializes transformative gene therapies for severe genetic diseases. Its product candidates for severe genetic diseases include betibeglogene autotemcel for the treatment of transfusion-dependent ß-thalassemia; lovotibeglogene autotemcel for the treatment of sickle cell disease (SCD); and elivaldogene autotemcel to treat cerebral adrenoleukodystrophy. The company's clinical study program includes HGB-205, HGB-206, and HGB-210 to evaluate the safety and efficacy of lovo-cel in the treatment of patients with SCD; and HGB-204, HGB-205, HGB-207, and HGB-212 to evaluate the safety and efficacy of beti-cel in the treatment of patients with ß-thalassemia.