1. Structure and role in symbiosis of the exoB gene of Rhizobium leguminosarum bv trifolii

   • B. Sánchez-Andújar
   • C. Coronado
   • A. J. Palomares

   ORIGINAL PAPER Pages: 131 - 140

2. The Drosophila ribosomal protein L14-encoding gene, identified by a novel Minute mutation in a dense cluster of previously undescribed genes in cytogenetic region 66D

   • S. Sæbøe-Larssen
   • B. Urbanczyk Mohebi
   • A. Lambertsson

   ORIGINAL PAPER Pages: 141 - 151

3. Primary Structure, sequence analysis, and expression of the thermostable d - hydantoinase from Bacillus stearothermophilus SD1

   • G.-J. Kim
   • J.-H. Park
   • H.-S. Kim

   ORIGINAL PAPER Pages: 152 - 156

4. A soluble 12-kDa protein of the mitochondrial intermembrane space, Mrs11p, is essential for mitochondrial biogenesis and viability of yeast cells

   • E. Jarosch
   • G. Rödel
   • R. J. Schweyen

   ORIGINAL PAPER Pages: 157 - 165

5. The role of cysteine residues in the homeodomain protein Matα2 in mating-type control of Saccharomyces cerevisiae

   • Y. Mukai
   • Y. Ohno-Yamashita
   • S. Harashima

   ORIGINAL PAPER Pages: 166 - 171

6. Ammonium repression of the nitrite-nitrate (nasAB) assimilatory operon of Azotobacter vinelandii is enhanced in mutants expressing the nifO gene at high levels

   • J. C. Gutierrez
   • E. Santero
   • M. Tortolero

   ORIGINAL PAPER Pages: 172 - 179

7. Molecular cloning and characterization of the cDNA encoding the largest subunit of mouse RNA polymerase I

   • P. Seither
   • J. F. Coy
   • I. Grummt

   ORIGINAL PAPER Pages: 180 - 186

8. The two β-lactamase genes of Streptomyces cacaoi, blaL and blaU, are under the control of the same regulatory system

   • J. Magdalena
   • C. Gérard
   • J. Dusart

   ORIGINAL PAPER Pages: 187 - 193

9. Mutations in the heavy chain of cytoplasmic dynein suppress the nudF nuclear migration mutation of Aspergillus nidulans

   • D. A. Willins
   • B. Liu
   • N. R. Morris

   ORIGINAL PAPER Pages: 194 - 200

10. A Darwinian theory for the origin of cellular differentiation

    • J. J. Kupiec

    ORIGINAL PAPER Pages: 201 - 208

11. The Uba2 and Ufd1 proteins of Saccharomyces cerevisiae interact with poly(A) polymerase and affect the polyadenylation activity of cell extracts

    • M. del Olmo
    • N. Mizrahi
    • C. L. Moore

    ORIGINAL PAPER Pages: 209 - 218

12. Gene targeting is locus dependent in the filamentous fungus Aspergillus nidulans

    • D. Bird
    • R. Bradshaw

    ORIGINAL ARTICLE Pages: 219 - 225

13. The Schizosaccharomyces pombe mam1 gene encodes an ABC transporter mediating secretion of M-factor

    • P. U. Christensen
    • J. Davey
    • O. Nielsen

    ORIGINAL PAPER Pages: 226 - 236