What is the promise of human embryonic stem cell research?
DEVELOPMENTAL BIOLOGY: Research is being conducted using human embryonic stem cells as a tool to better understand which genes, nutrients, growth factors and other environmental factors affect the function and development of an embryo in vivo. By uncovering and studying the fundamental events in human embryonic development, researchers can better understand the progression of cell-based diseases, birth defects, and the effects of chromosomal abnormalities on a developing embryo. This knowledge gained by in vitro research can lead to better understanding of causes and the advancement of treatments for such developmental conditions in vivo. DRUG SCREENING AND TOXICITY TESTING: Although the use of animal testing is essential in drug screening and pharmaceutical development, the inherent differences in biological systems between species means that animal research cannot always predict the effect that a drug may have on human cells. Human embryonic stem cells provide the means of generating
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