1. Evidence for chromosome instability in vivo in bloom syndrome: Increased numbers of micronuclei in exfoliated cells

   • Miriam P. Rosin
   • J. German

   Original Investigations Pages: 187 - 191

2. Mapping of seven polymorphic loci on human chromosome 13 by in situ hybridization

   • T. P. Dryja
   • C. C. Morton

   Original Investigations Pages: 192 - 195

3. Genetic complementation in somatic cell hybrids of four variants of infantile G_M2 gangliosidosis

   • S. Sonderfeld
   • S. Brendler
   • A. T. Hoogeveen

   Original Investigations Pages: 196 - 200

4. Recessive X-linked ichthyosis: lack of immunologically detectable steroid sulfatase enzyme protein

   • Ervin H. Epstein Jr.
   • Jeannette M. Bonifas

   Original Investigations Pages: 201 - 205

5. Differential sensitivity of Fanconi anaemia lymphocytes to the clastogenic action of cis-diamminedichloroplatinum (II) and trans-diamminedichloroplatinum (II)

   • E. H. A. Poll
   • F. Arwert
   • A. H. Wanamarta

   Original Investigations Pages: 206 - 210

6. Close linkage between Norrie disease, a cloned DNA sequence from the proximal short arm, and the centromere of the X chromosome

   • Liesbeth M. Bleeker-Wagemakers
   • Ursula Friedrich
   • H. -H. Ropers

   Original Investigations Pages: 211 - 214

7. Placental alkaline phosphatase types and subtypes determined by agarose gel electrophoresis and separator isoelectric focusing

   • M. Teder
   • J. Parik

   Original Investigations Pages: 215 - 218

8. DNA-polymorphic patterns linked to the β-globin genes in German families affected with hemoglobinopathies and thalassemias: a comparison to other ethnic groups

   • Renate Oehme
   • Elisabeth Kohne
   • J. Horst

   Original Investigations Pages: 219 - 222

9. Orosomucoid (ORM) typing by print lectinofixation: a new technique for isoelectric focusing. Two common alleles in Japan

   • K. Umetsu
   • N. Ikeda
   • T. Suzuki

   Original Investigations Pages: 223 - 224

10. Alpha-1-antitrypsin types in five Chinese national minorities

    • Ying Qi-long
    • Zhang Mei-lin
    • Gao Er-xi

    Original Investigations Pages: 225 - 226

11. Allelic variation adjacent to the human insulin and apolipoprotein C-II genes in different ethnic groups

    • L. G. Williams
    • N. I. Jowett
    • D. J. Galton

    Original Investigations Pages: 227 - 230

12. Two cases of X/autosome translocation in females with incontinentia pigmenti

    • Shirley V. Hodgson
    • B. Neville
    • M. Bobrow

    Original Investigations Pages: 231 - 234

13. Hereditary triose phosphate isomerase deficiency: seven new homozygous cases

    • Raymonde Rosa
    • Marie-Odette Prehu
    • R. Girod

    Original Investigations Pages: 235 - 240

14. Down syndrome: increased frequency of maternal meiosis I nondisjunction during the transitional stages of the ovulatory seasons

    • P. H. Jongbloet
    • O. J. Vrieze

    Original Investigations Pages: 241 - 248

15. Gene order on the short arm of human chromosome 11: regional assignment of the LDH A gene distal to catalase in two translocations

    • W. H. Lewis
    • J. M. Goguen
    • E. E. Michalopoulos

    Original Investigations Pages: 249 - 253

16. The isolation, characterisation, and chromosomal assignment of the gene for human 3-hydroxy-3-methylglutaryl coenzyme A reductase, (HMG-CoA reductase)

    • S. E. Humphries
    • F. Tata
    • R. Williamson

    Original Investigations Pages: 254 - 258

17. Duplication of 2p25: confirmation of the assignment of soluble acid phosphatase (ACP₁) locus to 2p25

    • Y. Wakita
    • K. Narahara
    • H. Kimoto

    Short Communications Pages: 259 - 260

18. Restriction fragment length polymorphism detected by human salivary amylase cDNA

    • Kanji Ishizaki
    • Asao Noda
    • Ken-ichi Matsubara

    Short Communications Pages: 261 - 262

19. A case report of a patient with retinoblastoma and chromosome 13q deletion: assignment of a new gene (gene for LCP1) on human chromosome 13

    • I. Kondo
    • K. Shin
    • H. Hamaguchi

    Clinical Case Reports Pages: 263 - 266

20. Acquired cystic kidney disease —a possible pitfall in genetic counseling

    • K. Zerres
    • Regina Albrecht
    • R. Waldherr

    Clinical Case Reports Pages: 267 - 269

21. Familial paracentric inversion in(2)(q31q36)

    • M. Schmid
    • R. Hofmann
    • U. Jannek

    Clinical Case Reports Pages: 270 - 272

22. Partial trisomy 2q+ as a result of a balanced translocation (1;2) (q43;q33)

    • Nada Barjaktarović
    • Gordana Joksić
    • Kostandina Popović

    Cases Observed Pages: 273 - 273

23. Sister chromatid exchanges in human fibroblasts characterized by monosomy X

    • J. -J. Cassiman
    • P. Vercauteren
    • H. Van den Berghe

    Letters to the Editors Pages: 274 - 275

24. Low alpha-fetoprotein and serum albumin levels in Morbus Down may point to a common regulatory mechanism

    • Theda Voigtländer
    • F. Vogel

    Letters to the Editors Pages: 276 - 277

25. Intraindividual Y-chromosome heteromorphism

    • H. Hoehn
    • D. M. Kurnit

    Letters to the Editors Pages: 278 - 278

26. Erratum

    • I. M. MacDonald
    • D. M. Cox

    Erratum Pages: 279 - 279

27. Announcements

    Announcement Pages: 280 - 280