14 March 2012 Last updated at 09:00 ET By Jane O'Brien BBC News, Maine

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One of Doreen Flynn's daughters, 13-year-old Jordan, says the whole transplant process scares her

A mother in the US is desperate to find bone marrow donors to save the lives of her three daughters who are critically ill from a rare blood disorder. Now, she is challenging a federal law barring her from compensating prospective donors.

Thousands of Americans who need transplants die every year because they cannot find a suitable donor, advocates say.

They propose a controversial way to encourage more people to come forward: Pay them.

"It is widening the donor pool. A lot of times employers don't pay for the time off that these donors take from work," says Doreen Flynn of Lewiston, Maine.

"So I think in those instances those people can say, 'you know I can do that,' knowing that there will be a support system for them at the end."

Ms Flynn's three daughters have a rare genetic blood disorder called Fanconi Anaemia. Their bone marrow does not make enough blood cells to keep them healthy and their only hope for survival is a transplant.

It is against US law to sell body parts - including bone marrow. But last year, Ms Flynn won a court ruling in favour of compensating donors whose blood stem cells are collected using a process called aphaeresis.

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Should it be legal to pay for bone marrow donations?