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Experts also say the rules were designed to reassure the public that stem cell research will proceed with tight ethical strictures.
"We're also concerned that the general public sees that the scientists are all playing from the same guidebook," Hynes says.
Experts called for a ban on all payments for cells or embryos, a measure Hynes says was necessary to keep the donations "altruistic" and free of questions of financial conflicts of interest.
That recommendation could prove controversial because many companies already pay women who donate their eggs for use by in vitro fertilization clinics, says Janet D. Rowley, MD, a professor of medicine at the University of Chicago and a member of the panel.
"That's, I think, going to be an issue where some people may accept the guidelines and some do not," she tells WebMD.
"It was the consensus of the panel that it should err on the side of being conservative in these matters," says Rowley, the only academy panel member who also sits on the President's Council on Bioethics, a White House group largely opposed to most forms of embryonic research.
Tuesday's recommendations would probably put the academy at odds with the President's Council, Rowley says.
The academy's recommendations call for a ban on all cloning intended as a means to reproduce a child. Several bills in Congress also seek to ban the practice, often called "reproductive cloning."
But panelists say they did not consider whether so-called meant for disease research should also be banned.