I. The Endocrine and Topographic Basis --;Proteins and Steroids in Early Pregnancy: General Considerations --;Ultrastructure of Trophoblast-Epithelium Relations During Implantation --;Hormonal Control of Decidualization --;Ultrastructural Observations on Luteal Cells and Interstitial Gland Cells During Pseudopregnancy --;II. The Protein Secretion in Early Pregnancy --;Uteroglobin and Other Endometrial Proteins: Biochemistry and Biological Significance in Beginning Pregnancy --;Localization of Uteroglobin and Related Secretion Proteins in Oviducal, Uterine and Blastocyst Cells --;Uteroglobin as a Sensitive Indicator for the Biological Activity of Progestogens --;Prefertilization Progesterone Treatment: Effect on Endometrium, Uteroglobin Secretion and Embryonic Development --;Evidence for the Existence of Human Uteroglobin? --;III. The Synthetic Machinery and Steroid-Protein Interactions --;Studies on Uteroglobin Messenger RNA --;Structure and Binding Properties of Rabbit Uteroglobin. Search for a Similar Protein in Human Uterine Fluid --;Steroid Binding to Uteroglobin --;Steroid Receptors in the Genital Tract and the Monitoring of Steroid Hormone Action --;IV. The Actions and Reactions of the Embryonic System --;The Synthesis of Steroids and Proteins in the Pig Blastocyst --;Steroid Hormones in Blastocyst Tissue, Uterine Flushings, and Endometrium of Pig, Sheep, and Cow --;Proteases of the Blastocyst and of the Uterus --;Embryo-Associated Plasminogen Activator Prior to and During Implantation in the Mouse --;Postfertilization Activation of Stored Maternal mRNA in the One-Cell Mouse Egg --;The Control of Blastocyst Activity --;V. Embryo-Maternal Interactions and Exogenous Interference --;Cellular and Molecular Aspects of Decidualization and Implantation --;Pharmacological Aspects of Early Pregnancy and Contraception --;Antifertility Effect of a Long-Acting Progestin (3-Cyclopentyl Propionate of Megestrol Acetate): Prematurity of the Endometrium and Accompanying Changes of Uteroglobin and Progesterone in Uterine Fluid.