Increased sister chromatid exchanges in human cell lines characterized by monosomy X or structural abnormalities of the X chromosome Mohammed A. IqbalAlice O. MartinJoe Leigh Simpson Original Investigations Pages: 205 - 208
Life span elongation of Werner's syndrome fibroblasts by co-culture with origin-defective SV-40 DNA transformed cells T. OhnoN. Yamaguchi Original Investigations Pages: 209 - 210
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. HookPhilip K. CrossRonald R. Regal Original Investigations Pages: 211 - 220
Human genes for glutathione S-transferases V. LaisneyNguyen Van CongJ. Frezal Original Investigations Pages: 221 - 227
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. PollF. ArwertA. W. Eriksson Original Investigations Pages: 228 - 234
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. LaurieR. W. PalmerM. A. Hultén Original Investigations Pages: 235 - 247
An aetiological study of 290 XXY males, with special reference to the role of paternal age Andrew D. CarothersSusan CollyerIsobel Johnstone Original Investigations Pages: 248 - 253
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. PodugolnikovaN. M. GrigorjevaM. G. Blumina Original Investigations Pages: 254 - 257
Separation of retinoblastoma and esterase D loci in a patient with sporadic retinoblastoma and del(13)(q14.1q22.3) Robert S. SparkesMaryellen C. SparkesChristine M. Disteche Original Investigations Pages: 258 - 259
α-Globin gene deletion causes α-thalassemia syndromes in two German families Jürgen HorstErnst-Ulrich GrieseElisabeth Kohne Original Investigations Pages: 260 - 263
A new α2HS-glycoprotein allele (AHS * 5 ⋆) in two Japanese families K. UmetsuS. KashimuraT. Suzuki Original Investigations Pages: 264 - 265
Origin of extra chromosome in Patau syndrome S. IshikiriyamaN. Niikawa Short Communications Pages: 266 - 268
Disturbances in collagen synthesis in trisomic cells from spontaneously aborted embryos V. I. KukharenkoA. A. DelvigK. N. Grinberg Short Communications Pages: 269 - 271
Partial trisomy 18 due to a maternal translocation t(9;18) Luisa De TorresAngeles Sánchez FerrerJ. A. Abrisqueta Case Observed Pages: 272 - 272
Prenatal diagnosis by trophoblast sampling Giovanni NeriG. SimoniM. Fraccaro Letters to the Editors Pages: 273 - 273