1. The actin loci in the genus Drosophila: establishment of chromosomal homologies among five palearctic species of the Drosophila obscura group by in situ hybridization

   • George P. Bondinas
   • Michael G. Loukas
   • Diether Sperlich

   Original Article Pages: 441 - 450

2. The genomic complexity of micro B chromosomes of Brachycome dichromosomatica

   • Andreas Houben
   • Dawn Verlin
   • Jeremy N. Timmis

   Original Article Pages: 451 - 459

3. Non-isotopic mapping of ribosomal RNA synthesis and processing in the nucleolus

   • David Staněk
   • Karel Koberna
   • Ivan Raška

   Original Article Pages: 460 - 470

4. Disassembly of nuclear bodies during arousal from hibernation: an in vitro study

   • Manuela Malatesta
   • Francesca Luchetti
   • Giancarlo Gazzanelli

   Original article Pages: 471 - 477

5. Colchicine promotes a change in chromosome structure without loss of sister chromatid cohesion in prometaphase I-arrested bivalents

   • Eva M. Rodríguez
   • Maria T. Parra
   • José A. Suja

   Original Article Pages: 478 - 486

6. Electron microscope mapping of the pericentric and intercalary heterochromatic regions of the polytene chromosomes of the mutant Suppressor of underreplication in Drosophila melanogaster

   • V. Semeshin
   • E. Belyaeva
   • I. Zhimulev

   Original Article Pages: 487 - 500

7. Lymphoblasts already in the DNA synthesis phase of the cell cycle can be reversibly arrested at the R/G transition

   • Josée Lavoie
   • Régen Drouin

   Original Article Pages: 501 - 510