A stem cell is a cell from the embryo or adult that has the ability to reproduce itself for long periods by cell division (NIH, Basics II). ... The embryos are derived from eggs that have been fertilized in-vitro (NIH, Basics III). ES and some fetal cells are currently the only stem cells that are pluripotent, which means they are the only stem cells that can become any of the cells in a living organism (NIH, Progress ES-2). ... The opponents of ES cell research site inferior stem cells derived from adult sources as an alternative source for stem cell research (Do No Harm). ... Another limitat...

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