the Moral Limits of Embryo and Embryonic Stem Cell Research? Search for Robert Song Biography Index Next >

A preimplantation embryo of 30-150 cells. Contains a layer of specialized cells is made up of trophoblasts, which attach to the uterine wall and form the placenta. Inside the trophoblast layer is the inner cell mass. These cells

of the germ layers of an embryo that is the source of the epithelium of the digestive tract and its derivatives. Contributed by: BU Search for Endoderm Full Glossary Index

primary germ layers of an embryo . It forms into many of the bodily tissues and structures such as bone, muscle, connective tissue, and skin. Contributed by: BU Search for Mesoderm Full

of the whole or a part of an embryo ; the sequence whereby complex microcosm-macrocosm interchanges occur which further develop the microcosm’s given form or structure. For example, the maturation of an adult mammal from a fertilized ovum,

cell types. In contrast, embryonic stem (ES) cells are not limited in there potential to differentiate into every cell type. Embryonic germ (EG) cells have the same potential as ES cells . It is the versatility and nonspecifically of these

All cells within the early embryo are totipotent up until the 16 cell stage or so. Related Topics: Genetics Contributed by: Dr. Ted Peters Search for Totipotent Stem Cells

The zygote develops into an embryo . Related Topics: Genetics Contributed by: CTNS Search for Zygote Full Glossary Index Next >

preimplantation stage of the embryo (or pre-embryo) to determine if the word “abortion” applies. If it does, this may lead to recommending that genetic screening be pushed back one step further, to the gamete stage prior to

near Edinburgh, Scotland, embryologist Ian Wilmut produced a live adult lamb from cells originating in a sheep mammary gland. The method was simple, technologically speaking; Wilmut took a mammary cell from an adult sheep and placed its DNA