[1] Univ Alberta, Dept Ophthalmol, Edmonton, AB T6G 2H7, Canada
[2] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada
[3] Univ British Columbia, Dept Cell & Dev Biol, Vancouver, BC V6T 1Z3, Canada
[4] CERTO EA 2502 Minist Rech, Fac Med, F-75015 Paris, France
[5] Stowers Inst Med Res, Kansas City, MO 64110 USA
[6] Univ Alberta, Dept Med Genet, Edmonton, AB T6G 2H7, Canada
[7] Univ Alberta, Dept Pharm & Pharmaceut Sci, Edmonton, AB T6G 2H7, Canada
[8] Washington Univ, Dept Orthoped Surg, St Louis, MO 63130 USA
[9] Marshfield Clin Fdn Med Res & Educ, Dept Med Genet Serv, Marshfield, WI 54449 USA
[10] NEI, Ophthalm Genet & Visual Funct Branch, NIH, Bethesda, MD 20892 USA
[11] Aravind Eye Hosp, Dept Paediat Ophthalmol & Strabismus, Madurai, Tamil Nadu, India
[12] Aravind Med Res Fdn, Dept Genet, Madurai, Tamil Nadu, India
[13] MRC Human Genet Unit, Edinburgh EH4 2XU, Midlothian, Scotland