Source:http://linkedlifedata.com/resource/umls/id/C0013935
NCI: Early stage in the development of a plant or an animal. In vertebrate animals (have a backbone or spinal column), this stage lasts from shortly after fertilization until all major body parts appear. In particular, in humans, this stage lasts from about 2 weeks after fertilization until the end of the seventh or eighth week of pregnancy.,NCI: Having to do with an embryo, which is an early stage in the development of a plant or animal.,MSH: The entities of developing ANIMALS in early stages.