Abstract
Culturing cells, tissues and organs outside the body has afforded the researcher the opportunity to study cellular behavior in greater detail. One area in which organ culture techniques are particularly valuable is the study of implantation. No biological event in animals is more protected, shielded and hidden by nature than the development of the fertilized ovum and its penetration of the maternal uterus. Organ culture offers the opportunity to study this series of events in progress, as well as to manipulate the environment and observe variations in behavior.