1. Introduction and Notes on Materials and Methods

2. Submicroscopic Structure and Ultracytochemistry of Segmenting Rat Ova
2.1. One-Cell Ovum
2.2. Two-Cell Ovum
2.3. Four-Cell Ovum
2.4. Eight-Cell Ovum
2.5. Morula
2.6. Early Blastocyst
2.7. Late Blastocyst
2.8. Conclusion
3. Morphologic and Functional Relationship During the Cleavage of Mammalian Ova
3.1. Surface Coats and Cell Contacts of the Ovum, Their Differentiation and Function During Cleavage
3.2. Nucleus, Nucleoprotein Structures, and Proteosynthesis in the Segmenting Ova
3.3. Mitochondria and Energetic Metabolism of Segmenting Ova
3.4. Lysosomes and Their Importance for the Differentiation and Nutrition of the Segmenting Ovum
3.5. Occurrence of Stored Material and Its Metabolism in Segmenting Ova
Summary
References.