1. Nonspecific X-linked mental retardation—A review

   • Gholamali Tariverdian
   • Barbara Weck

   Review Articles Pages: 95 - 109

2. G6PD-Puerto Limón: A new deficient variant of glucose-6-phosphate dehydrogenase associated with congenital nonspherocytic hemolytic anemia

   • J. Elizondo
   • G. F. Sáenz
   • M. Estrada

   Original Investigations Pages: 110 - 112

3. Tiny interstitial duplication of proximal 7q in association with a maternal paracentric inversion

   • J. J. Hoo
   • R. Lorenz
   • W. Fuhrmann

   Original Investigations Pages: 113 - 116

4. Study on segregation of the inversion of chromosome 4 (p15.2q11) in two unrelated families

   • Carlo Baccichetti
   • Romano Tenconi
   • Livio Bortotto

   Original Investigations Pages: 117 - 120

5. Polymorphism of the Hinf I restriction site located 1 Kb 5′ to the human β-globin gene

   • Gila Kohen
   • Noël Philippe
   • Jacqueline Godet

   Original Investigations Pages: 121 - 123

6. Hereditary retinoblastoma: Lack of maternal effect

   • E. Matsunaga

   Original Investigations Pages: 124 - 128

7. Parental origin of chromosome abnormalities in spontaneous abortions

   • Gitta H. M. Meulenbroek
   • Joep P. M. Geraedts

   Original Investigations Pages: 129 - 133

8. Seasonality of pre-ovulatory non-disjunction and the aetiology of Down syndrome. A European collaborative study

   • P. H. Jongbloet
   • AnneMartijn Mulder
   • A. J. Hamers

   Original Investigations Pages: 134 - 138

9. PI (α₁-antitrypsin) subtypes: Frequency of PI*M4 in several populations

   • E. C. Klasen
   • Anja Bos
   • H. D. Simmelink

   Original Investigations Pages: 139 - 141

10. Genetic analysis of human lymphocyte proteins by two-dimensional gel electrophoresis: 3. Frequent occurrence of genetic variants in some abundant polypeptides of PHA-stimulated peripheral blood lymphocytes

    • Hideo Hamaguchi
    • Michiko Yamada
    • Ikuko Kondo

    Original Investigations Pages: 142 - 147

11. Genetic analysis of human lymphocyte proteins by two-dimensional gel electrophoresis: 4. Genetic polymorphism of cytosol 100k polypeptide

    • Hideo Hamaguchi
    • Michiko Yamada
    • Ikuko Kondo

    Original Investigations Pages: 148 - 151

12. Distribution of physiological adult lactase phenotypes, lactose absorber and malabsorber, in Germany

    • G. Flatz
    • J. N. Howell
    • S.D. Flatz

    Original Investigations Pages: 152 - 157

13. Distribution of human adult lactase phenotypes in the population of Austria

    • W. Rosenkranz
    • B. Hadorn
    • G. Flatz

    Original Investigations Pages: 158 - 161

14. Frequency of the ESD*5 allele in three ethnic groups in Minnesota

    • Dale D. Dykes
    • Herbert F. Polesky
    • Shirley Miller

    Original Investigations Pages: 162 - 163

15. Mapping the α-globin genes in HB J Mexico carriers

    • G. Trabuchet
    • F. Morle
    • V. M. Nigon

    Original Investigations Pages: 164 - 166

16. Paternal age and Down's syndrome genotypes diagnosed prenatally: No association in New York State data

    • Ernest B. Hook
    • Philip K. Cross

    Original Investigations Pages: 167 - 174

17. A Hind III restriction site polymorphism in the human collagen α1(I)-like gene on chromosome No. 7

    • Albert J. Driesel
    • Anna M. Schumacher
    • Richard A. Flavell

    Short Communications Pages: 175 - 176

18. A foetal alpha-1 antitrypsin which resembles PI*I

    • Peggy Clark
    • P. Doyle

    Short Communications Pages: 177 - 179

19. Letters to the Editors

    • I. Anton-Lamprecht
    • M. -L. Arnold
    • U. W. Schnyder

    Letter Pages: 180 - 180

20. Regional mapping of the locus for hexokinase-1 (HK1)

    • Mauro Magnani
    • Bruno Dallapiccola

    Letters to the Editors Pages: 181 - 181