As Biogen Inc. (Nasdaq: BIIB) continues to struggle to capitalize on the Alzheimer’s drug Aduhelm (aducanumab), the company is highlighting new data from its Spinraza (nusinersen) and spinal muscular atrophy (SMA) research program. First approved in 2016, Spinraza is a survival motor neuron-2 (SMN2)-directed antisense oligonucleotide indicated to treat spinal muscular atrophy (SMA). At the…