Group 1a and 1b: 0.1 x 10⁹ (range: 0.08 x 10⁹-0.12 x 10⁹) transduced cells. Group 2: 1 x 10⁹ (range: 0.8 x 10⁹- 1.2 x 10⁹) transduced cells. Group 3: 5 x 10⁹ (range: 1 x 10⁹- 6 x 10⁹) transduced cells.