41. Biography: Robert Song
the Moral Limits of
Embryo and Embryonic Stem Cell Research?
for Robert Song
42. General Term: Blastocyst
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
43. General Term: Endoderm
the germ layers of an embryo that is the source of the epithelium of the
digestive tract and its derivatives.
Full Glossary Index
44. General Term: Mesoderm
primary germ layers of an embryo . It
forms into many of the bodily tissues and structures such as bone, muscle,
connective tissue, and skin.
45. General Term: Morphogenesis
of the whole or a part of an embryo ; the sequence whereby complex
microcosm-macrocosm interchanges occur which further develop the microcosms
given form or structure. For example, the maturation of an adult mammal from a
46. General Term: Stem Cells
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
47. General Term: Totipotent Stem Cells
cells within the early embryo are totipotent up until the 16 cell stage or so.
by: Dr. Ted Peters
for Totipotent Stem Cells
48. General Term: Zygote
The zygote develops
into an embryo .
Full Glossary Index
49. Genetics Topic: Testing Early in Pregnancy
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
50. Genetics Topic: Cloning
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