A study released Sunday shows embryonic stem cells and induced pluripotent stem cells are almost identical. Since human IPS cells were first produced from mouse cells in 2006 and from human cells in 2007, it has been thought they were equivalent to embryonic stem cells, which are controversial because they are derived from human embryos. But new research, directed by Josh Coon, a UW-Madison associate professor of chemistry and biomolecular chemistry, shows the proteins in the two types of cells are almost identical.
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