Ultimately, the three new stem cell lines were created.

A 2001 Bush administration decision limits researchers using federal money to existing stem cell lines.

"Some embryonic stem cell lines make particular tissues better than others."

That could make a lot more stem cell lines available, but not the kind vital for studying many diseases.

Under the president's current policy, federal funds can be used to support research on only some 20 stem cell lines that have limited scientific value.

A critical issue, he said, is the administration's position on existing stem cell lines.

Many alternative avenues for research with adult stem cell lines have yet to be developed.

Voted to expand the number of stem cell lines available for research.

He's limited federal funding to research using existing stem cell lines only.

As a result of private research, more than 60 genetically diverse stem cell lines already exist.

Ultimately, the three new stem cell lines were created.

A 2001 Bush administration decision limits researchers using federal money to existing stem cell lines.

"Some embryonic stem cell lines make particular tissues better than others."

That could make a lot more stem cell lines available, but not the kind vital for studying many diseases.

Under the president's current policy, federal funds can be used to support research on only some 20 stem cell lines that have limited scientific value.

A critical issue, he said, is the administration's position on existing stem cell lines.

Many alternative avenues for research with adult stem cell lines have yet to be developed.

Voted to expand the number of stem cell lines available for research.

He's limited federal funding to research using existing stem cell lines only.

As a result of private research, more than 60 genetically diverse stem cell lines already exist.