1. Lithium induces dorsal-type migration of mesodermal cells in the entire marginal zone of urodele amphibian embryos

   • De-Li Shi
   • Jean-Claude Beetschen
   • Jean-Claude Boucaut

   OriginalPaper Pages: 1 - 13

2. Quantitative analysis of cellular differentiation during early embryogenesis ofPlatynereis dumerilii

   • Adriaan W. C. Dorresteijn

   OriginalPaper Pages: 14 - 30

3. Sensitive periods for abnormal patterning on a leg segment inDrosophila melanogaster

   • Lewis I. Held Jr.

   OriginalPaper Pages: 31 - 47

4. Arrangement of bristles as a function of bristle number on a leg segment inDrosophila melanogaster

   • Lewis I. Held Jr.

   OriginalPaper Pages: 48 - 62

5. Editorial

   • Klaus Sander

   EditorialNotes Pages: E1 - E1