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They started with a human embryonic stem cell, editing its TKTL1 gene so that it no longer had the human mutation.

When voters approved the initial $3 billion in 2004, President George W. Bush’s administration had banned the use of federal funds for research using newly created human embryonic stem cell lines.

Federal funding resumed in 2009, and thus far this year the National Institutes of Health has spent about $321 million on human embryonic stem cell research.

At that time, the George W. Bush administration had banned the use of federal funds for research using newly created human embryonic stem cell lines.

At least 10 of the board’s 15 members have publicly opposed abortion, fetal tissue research, human embryonic stem cell research, contraception or a combination of these.