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Title: polio vaccine
Review: In a description you can find the following "WI-38 strain, taken from aborted fetus cells used to develop a polio vaccine". It's weird since polio vaccine was develop in 1952, and first stem cells research on human cell began mainly in "1998: James Thomson and coworkers derive the first human embryonic stem cell line at the University of Wisconsin-Madison". So, how is it possible that polio vaccine was develop from stem cell taken from aborted fetus if stem cell research was not done in this time period.
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