1. Editorial

   • R. Weber

   EditorialNotes Pages: 305 - 305

2. Chromatin diminution and early cleavage in Parascaris univalens (Nematoda)

   • Christof Seidl
   • Michael Bauer
   • Karl B. Moritz

   OriginalPaper Pages: 307 - 320

3. Taurine found to stabilize the larval state is released upon induction of metamorphosis in the hydrozon Hydractinia

   • Stefan Berking

   OriginalPaper Pages: 321 - 327

4. Extramacrochaetae, a trans-acting gene of the achaete-scute complex of Drosophila involved in cell communication

   • Luis A. García Alonso
   • Antonio García -Bellido

   OriginalPaper Pages: 328 - 338

5. Protein kinases in amphibian ectoderm induced for neural differentiation

   • Michael Davids

   OriginalPaper Pages: 339 - 344

6. Terminal versus segmental development in the Drosophila embryo: the role of the homeotic gene fork head

   • Gerd Jürgens
   • Detlef Weigel

   OriginalPaper Pages: 345 - 354

7. Segment- and nest-specific determination in the histoblasts of the housefly

   • Mekkara Mandaravally Madhavan
   • Kornath Madhavan
   • P. Sivasubramanian

   Short Communications Pages: 355 - 359

8. Centrifugation of 2-cell mouse ova: cytoplasm stratification and recovery

   • Verónica Téllez
   • Ariel Ahumada
   • Luis Izquierdo

   Short Communications Pages: 360 - 365

9. Increase in activity of acetylcholinesterase by 20-OH-ecdysone in a Chironomus tentans cell line

   • Margarethe Spindler-Barth
   • Heinrich Schmidt
   • Klaus -Dieter Spindler

   Short Communications Pages: 366 - 369

10. Abnormal ovarian morphogenesis in Drosophila melanogaster after injection of embryos with conditioned media from the Daudi cell line

    • Noëlle Richard -Mercier
    • Michèle Thomas -Orillard
    • Marc Fellous

    Short Communications Pages: 370 - 374