New guidelines on federal funding for stem cell research have set limitations on how far scientists can go when using leftover embryos.

The National Institutes of Health says scientists who want taxpayer funding for stem cell research can only use embryos that would otherwise be thrown away.

The rule was made to rid concerns that scientists would create embryos specifically to use them for research.

"We think this will be a huge boost for the science," said Acting NIH Director Raynard Kington. "This was the right policy for the agency at this point in time."  Read the new guidelines here.

CBN News White House Correspondent David Brody says the new guidelines may not please everyone, but can be seen as "a sigh of relief for some in the faith community."

"His policies may not 'jive' totally with conservative Evangelicals and this move may not win any of his political enemies over but Mr. Obama seems to be showing a willingness to understand the sensitive nature of the matter," he wrote on his blog, The Brody File.

Brody also wasn't surprised that some scientists are disappointed with the new guidelines.

Many had hoped that the guidelines would give them permission to use stem cells derived from embryos created just for science, and perhaps even those created using cloning techniques, making them genetically customized for a potential recipient.

The goal for scientists is to harness embryonic stem cells -- master cells that can morph into any cell of the body-- and create replacement tissues to better treat or cure ailments ranging from diabetes to Parkinson's disease.

The public gets a month to comment on the guidelines before final rules are issued by early July.