Recent Progress in the Identification of the X-Linked Infantile Spinal Muscular Atrophy (Xl-SMA) Gene: Implications for Neuronal Apoptosis - L. L. Baumbach; D. Dressman; H. Basterrechea; M. E. Ahearn; N. T. Bech-Hansen; R. D. Clark; A. Meind; E. Hoffman (The Scientific World Journal)