1. The gene in search of an identity

   • Raphael Falk

   Review Articles Pages: 195 - 204

2. Increased sister chromatid exchanges in human cell lines characterized by monosomy X or structural abnormalities of the X chromosome

   • Mohammed A. Iqbal
   • Alice O. Martin
   • Joe Leigh Simpson

   Original Investigations Pages: 205 - 208

3. Life span elongation of Werner's syndrome fibroblasts by co-culture with origin-defective SV-40 DNA transformed cells

   • T. Ohno
   • N. Yamaguchi

   Original Investigations Pages: 209 - 210

4. The frequency of 47,+21, 47,+18, and 47,+13 at the uppermost extremes of maternal ages: results on 56,094 fetuses studied prenatally and comparisons with data on livebirths

   • Ernest B. Hook
   • Philip K. Cross
   • Ronald R. Regal

   Original Investigations Pages: 211 - 220

5. Human genes for glutathione S-transferases

   • V. Laisney
   • Nguyen Van Cong
   • J. Frezal

   Original Investigations Pages: 221 - 227

6. Fanconi anaemia cells are not uniformly deficient in unhooking of DNA interstrand crosslinks, induced by mitomycin C or 8-methoxypsoralen plus UVA

   • E. H. A. Poll
   • F. Arwert
   • A. W. Eriksson

   Original Investigations Pages: 228 - 234

7. Studies on chiasma frequency and distribution in two fertile men carrying reciprocal translocations; one with a t(9;10) karyotype and one with a t(Y;10) karyotype

   • D. A. Laurie
   • R. W. Palmer
   • M. A. Hultén

   Original Investigations Pages: 235 - 247

8. An aetiological study of 290 XXY males, with special reference to the role of paternal age

   • Andrew D. Carothers
   • Susan Collyer
   • Isobel Johnstone

   Original Investigations Pages: 248 - 253

9. Relationship of the variability of the heterochromatic regions of chromosomes 1, 9, 16, and Y to some anthropometric characteristics in children with embryopathies of unknown etiology and in children with Down syndrome

   • O. A. Podugolnikova
   • N. M. Grigorjeva
   • M. G. Blumina

   Original Investigations Pages: 254 - 257

10. Separation of retinoblastoma and esterase D loci in a patient with sporadic retinoblastoma and del(13)(q14.1q22.3)

    • Robert S. Sparkes
    • Maryellen C. Sparkes
    • Christine M. Disteche

    Original Investigations Pages: 258 - 259

11. α-Globin gene deletion causes α-thalassemia syndromes in two German families

    • Jürgen Horst
    • Ernst-Ulrich Griese
    • Elisabeth Kohne

    Original Investigations Pages: 260 - 263

12. A new α₂HS-glycoprotein allele (AHS ^* 5 ^⋆) in two Japanese families

    • K. Umetsu
    • S. Kashimura
    • T. Suzuki

    Original Investigations Pages: 264 - 265

13. Origin of extra chromosome in Patau syndrome

    • S. Ishikiriyama
    • N. Niikawa

    Short Communications Pages: 266 - 268

14. Disturbances in collagen synthesis in trisomic cells from spontaneously aborted embryos

    • V. I. Kukharenko
    • A. A. Delvig
    • K. N. Grinberg

    Short Communications Pages: 269 - 271

15. Partial trisomy 18 due to a maternal translocation t(9;18)

    • Luisa De Torres
    • Angeles Sánchez Ferrer
    • J. A. Abrisqueta

    Case Observed Pages: 272 - 272

16. Prenatal diagnosis by trophoblast sampling

    • Giovanni Neri
    • G. Simoni
    • M. Fraccaro

    Letters to the Editors Pages: 273 - 273