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The Visible Embryo
Discover the development of an embryo. Beginning with fertilization and progressing through each stage in the first trimester and continuing every two weeks for the second and third trimesters. This site is meant for medical students and...
National Institutes of Health
National Institutes of Health: Potential Uses of Human Stem Cells
Stem cell therapy holds a great deal of promise, but years of intensive research are needed to develop their full potential. This informative site looks at the possibilities and challenges related to the potential uses of stem cells.