Comment on

• Leber hereditary optic neuropathy: involvement of the mitochondrial ND1 gene and evidence for an intragenic suppressor mutation.

  Howell N, Kubacka I, Xu M, McCullough DA. Howell N, et al. Am J Hum Genet. 1991 May;48(5):935-42. Am J Hum Genet. 1991. PMID: 2018041 Free PMC article.
• An example of Leber hereditary optic neuropathy not involving a mutation in the mitochondrial ND4 gene.

  Howell N, McCullough D. Howell N, et al. Am J Hum Genet. 1990 Oct;47(4):629-34. Am J Hum Genet. 1990. PMID: 2121024 Free PMC article.