... are a controversial topic on the national political spectrum. However, many of those who are opposed to stem cell research object to embryonic stem cells being used those being taken from embryos produced by in vitro fertilization and which have ...
http://www.healthcentral.com/osteoarthritis/c/215658/158966/explainer/
http://www.healthcentral.com/osteoarthritis/c/215658/158966/explainer/
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