WASHINGTON — Scientists can start using taxpayer dollars to do research with 13 batches of embryonic stem cells and the government says dozens more cell lines should be available soon, opening a new era for the potentially life-saving field.
President Barack Obama lifted eight years of restrictions on these master cells last spring. But $21 million-and-counting in new projects were on hold until the National Institutes of Health determined which of hundreds of existing stem cell lines were ethically appropriate to use.
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