My daughter has Duane retraction syndrome. She is also left-handed and has very small ears and ear lobes. No one else on my side of the family, or her father's, have these signs. When her father was younger he experimented with LSD. I don't know how many times he took the drug. I remember hearing years ago that people who have taken LSD might have offspring with missing chromosomes. Has this been verified as being one cause of the major missing chromosome for DRS?