Developmental Ontology Tree

The developmental ontology tree presents a low-resolution overview of the development of the organs/tissues. The "early development" stages, starting from the zygote, through the three germ layers (ectoderm, mesoderm and endoderm), describe human development in the database. Later stages of embryonic development, from the formation of the three germ layers to their derived organs and tissues, are described mostly for the mouse embryo in the database.