1. Ernst Hadorn

   • Walter J. Gehring

   Announcement Pages: 227 - 228

2. Construction and restriction endonuclease mapping of hybrid plasmids containing Saccharomyces cerevisiae ribosomal DNA

   • Jane Harris Cramer
   • Frances W. Farrelly
   • Robert H. Rownd

   OriginalPaper Pages: 229 - 244

3. Accessibility of proteins in 50S ribosomal subunits of Escherichia coli to antibodies: An ultracentrifugation study

   • C. A. Morrison
   • G. Tischendorf
   • R. A. Garrett

   OriginalPaper Pages: 245 - 252

4. Anisomycin sensitive mutants of Physarum polycephalum isolated by cyst selection

   • Jessica A. Gorman
   • William F. Dove
   • Eva Shaibe

   OriginalPaper Pages: 253 - 259

5. A spectinomycin dependent mutant of Escherichia coli

   • Eric R. Dabbs

   OriginalPaper Pages: 261 - 267

6. Evidence against mutational “hot-spots” at aggregation loci in Dictyostelium discoideum

   • M. B. Coukell

   OriginalPaper Pages: 269 - 273

7. Linkage analysis of developmental mutations in aggregation-deficient mutants of Dictyostelium discoideum

   • M. B. Coukell
   • N. M. Roxby

   OriginalPaper Pages: 275 - 288

8. Early developmental subdivisions of the wing disk in Drosophila

   • P. Babu

   OriginalPaper Pages: 289 - 294

9. Suppression of polarity of insertion mutations within the gal operon of E. coli

   • Jürgen Besemer
   • Maria Herpers

   OriginalPaper Pages: 295 - 304

10. In vitro transcription of the ribosomal RNA genes of E. coli DNA

    • János Sümegi
    • Andor Udvardy
    • Pál Venetianer

    OriginalPaper Pages: 305 - 312

11. Growth and reactivation of single stranded DNA phageϕX174 in E. coli undergoing “thymineless death”

    • Ashoke R. Thakur
    • Ramendra K. Poddar

    OriginalPaper Pages: 313 - 318

12. Mechanism of conjugation and recombination in bacteria XVI

    • Hanna Białowska-Hobrzańska
    • Władyslaw J. H. Kunicki-Goldfinger

    OriginalPaper Pages: 319 - 326

13. Altered tetracycline resistance in pSC101 recombinant plasmids

    • Robert C. Tait
    • Raymond L. Rodriguez
    • Herbert W. Boyer

    OriginalPaper Pages: 327 - 331

14. Respiratory repression and the stability of the mitochondrial genome

    • Jeremy Z. Meyer
    • Peter A. Whittaker

    OriginalPaper Pages: 333 - 342