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This is a microphotograph of a just-fertilized ovum; it is called a zygote
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Embryo research Definition and description of embryo research Stem cell research is a relatively new technology that uses human embryo cells to treat disease. The embryo cells are called "stem cells" because they can be stimulated to develop into any type of body cell or system. Human embryo cells are especially valuable because they can be used to treat and possibly cure many diseases such as heart disease, diabetes, and Alzheimer. Stem cells have been identified in placental tissue, blood, and fat but these sources are limited in their efficacy. Embryonic stem cells have much more potential and are harvested when the embryos are no more than a few days old. The process destroys the embryos. The biggest source of human embryos is those left over from in-vitro fertilization procedures. Fertility treatments usually result in multiple embryos. Since only the most viable are selected for implantation, the remaining embryos are frozen. Costs are incurred...
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