研究人员发现脊髓性肌萎缩的新病因

Over15yearsago,researcherslinkedadefectinagene1calledsurvivalmotorneuron--orSMN--withthefataldiseasespinal2muscularatrophy3（肌肉萎缩）.BecauseSMNhadaroleinassemblingtheintracellular（细胞内的）machinery4thatprocessesgenetic5material,itwasassumedthatfaultyprocessingwastoblame.Now,UniversityofNorthCarolinascientistshavediscoveredthatthis

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