BMP4 and spinal muscular atrophy, type III: The expression of Bmp4 (1.36 ± 0.30, P = 0.174), Bcl2 (1.10 ± 0.055, P = 0.196), and IL6 (1.25 ± 0.14, P = 0.315) in type III SMA mice did not differ significantly from that of age-matched controls.