1. Cellular development of a nematode: 3-D computer reconstruction of living embryos

   • Einhard Schierenberg
   • Christopher Carlson
   • Wayne Sidio

   OriginalPaper Pages: 61 - 68

2. Quantitative study of regression and regeneration of the thymic cell population after X-irradiation in the newtPleurodeles waltlii Michah

   • Yehia Moustafa
   • Pierre Chibon

   OriginalPaper Pages: 69 - 78

3. Head regeneration and polarity reversal inHydra attenuata can occur in the absence of DNA synthesis

   • Susan G. Cummings
   • Hans R. Bode

   OriginalPaper Pages: 79 - 86

4. Differentiation of histospecific ultrastructural features in cells of cleavage-arrested early ascidian embryos

   • Robert J. Crowther
   • J. R. Whittaker

   OriginalPaper Pages: 87 - 98

5. Heterospecific combinations of germ cells and gonadal soma betweenDrosophila melanogaster, D. mauritiana andD. ananassae

   • Helen Schmid
   • Lucas Sánchez
   • Rolf Nöthiger

   OriginalPaper Pages: 99 - 106

6. Selective mirror-image reversal of ciliary patterns inTetrahymena thermophila homozygous for ajanus mutation

   • Joseph Frankel
   • Leslie Meek Jenkins
   • Julita Bakowska

   OriginalPaper Pages: 107 - 120