1. Antonarakis SE and the Down syndrome collaborative group (1991) Parental origin of the extra chromosome in trisomy 21 as indicated by analysis of DNA polymorphisms. N Engl J Med 324:872–876
2. Antonarakis SE, Petersen MB, McInnis MG, Adelsberger PA, Schinzel AA, Binkert F, Pangalos C, Raoul O, Slaugenhaupt SA, Hafez M, Cohen MM, Roulson D, Schwartz S, Mikkelsen M, Tranebjaerg L, Greenberg F, Hoar DI, Rudd NL, Warren AC, Metaxotou C, Bartsocas C, Chakravarti A (1992) The meiotic stage of nondisjunction in trisomy 21: determination by using DNA polymorphisms. Am J Hum Genet 50:544–550
3. Antonarakis SE, Avramopoulos D, Blouin J-L, Talbot CC Jr, Schinzel AA (1993) Mitotic errors in somatic cells cause trisomy 21 in about 4.5% of cases and are not associated with advanced maternal age. Nature Genet 3:146–150
4. Babu A, Verma RS (1986) The heteromorphic marker on chromosome 18 using restriction endonucleaseAluI. Am J Hum Genet 38:549–554
5. Bugge M, Petersen M, Hertz J, Mikkelsen M (1994) DNA studies in trisomy 18. Cytogenet Cell Genet 65:141–165