Reflections on method: Theodor Boveri's evaluation of “natural experiments” and their table-top simulation Klaus Sander Essay Pages: 313 - 315
Proteoglycans with affinity for the neuralizing factor and the vegetalizing factor (activin A homologue) Hildegard TiedemannJochen BornHeinz Tiedemann Original Articles Pages: 316 - 320
Morphological aspects of fertilization in Phallusia (Ascidia) nigra (Ascidiacea, Tunicata) Makoto Fukumoto Original Articles Pages: 321 - 328
Organogenesis in the leech: development of nephridia, bladders and their innervation Angela WenningMary Anne CahillUrsula Kaltenhäuser Original Articles Pages: 329 - 340
Drosophila glial architecture and development: analysis using a collection of new cell-specific markers Heidi B. NelsonAllen Laughon Original Articles Pages: 341 - 354
Differential expression of type II cytokeratin mRNA defines early developmental boundaries within the ectoderm, mesoderm and endoderm during chick development Jonathan J. HenryTimothy S. CharleboisRobert M. Grainger Original Articles Pages: 355 - 363
Thrombomodulin distribution during murine development Virginia A. FordJohn E. WilkinsonStephen J. Kennel Original Articles Pages: 364 - 370
A late role for a subset of neurogenic genes to limit sensory precursor recruitments in Drosophila embryos Rolf BodmerLily Yeh JanYuh-Nung Jan Original Articles Pages: 371 - 381