Complex sentence: In about 50% of NF1 cases, the mutated gene is inherited from an affected parent, and the remaining cases occur in people with no family history of the disorder and result from de novo mutations in the NF1 gene (9).
Split into simpler sentences: In about 50% of NF1 cases, the mutated gene is inherited from an affected parent. The remaining cases occur in people with no family history of the disorder and result from de novo mutations in the NF1 gene (9).