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But in March 2009, President Obama authorized more funding for embryonic stem-cell research, and federal guidelines now let couples donate unwanted frozen embryos to such researchers with the proviso that they cannot receive cash, services or special treatment in exchange for their donations.

Mr. Stoddart, whose organization uses federal funds to run embryoadoption.org, said there are several reasons to continue the funding.

The number of human embryos in storage is still increasing, as are the number of babies born from embryo adoption, he said, noting that his agency’s own Snowflakes Embryo Adoption program is expecting its 300th child to be born March 30.

The number of adoption agencies opening embryo-adoption programs also is increasing, said Mr. Stoddart. “So those three factors would clearly indicate to me, and I think, any objective observer, that there’s an increasing interest in embryo donation and adoption.”

But, except for the federal program, “there is no other source of funding for an awareness campaign,” he said.