Anti-abortion activists set off the uproar by releasing undercover videos of Planned Parenthood officials that raised questions of whether the organization was profiting from the sale of fetal tissue. Planned Parenthood, which provides reproductive health as well as contraception and abortion services, has denied making any profit and said it charges fees solely to cover its costs.
Fetal cells are considered ideal because they divide rapidly, adapt to new environments easily and are less susceptible to rejection than adult cells when transplanted.
"If researchers are unable to work with fetal tissue, there is a huge list of diseases for which researchers would move much more slowly, rather than quickly, to find their cause and how they can be cured," Stanford University spokeswoman Lisa Lapin said in an email.
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A few institutions have consistently gotten large shares of that money, including Yale, the University of California and Massachusetts General Hospital, which is affiliated with Harvard.
The US government prohibits the sale of fetal tissue for profit and requires separation between researchers and the women who donate fetuses. Some schools go further, requiring written consent from donors.
Many major universities declined to make scientists available for interviews about their fetal tissue work, saying they fear for the researchers' safety because the issue is so highly charged. The Planned Parenthood uproar led to a failed attempt by Republicans to strip the organization of federal funding.