Embryo Research

**Definition:** Experimentation on, or using the organs or tissues from, a human or other mammalian conceptus during the prenatal stage of development that is characterized by rapid morphological changes and the differentiation of basic structures. In humans, this includes the period from the time of fertilization to the end of the eighth week after fertilization.

**Tree numbers:** - E05.313 - H01.770.644.145.250

**Synonyms:** - Embryo Experimentation - Human Embryo Research