title: Monozygotic twins discordant for Duane's retraction syndrome.
abstract: Monozygotic twin boys discordant for the occurence of Duane's retraction syndrome are presented. This appears to be the first report of such discordance between monozygotic twins. The theoretic problems which this situation poses for the explanation of the acquisition of Duane's retraction syndrome is discussed.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004200:Diseases in Twins; D004370:Duane Retraction Syndrome / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D009886:Ophthalmoplegia / Q000235:genetics*; D011247:Pregnancy; D011248:Pregnancy Complications; D014427:Twins; D014430:Twins, Monozygotic