Michigan voters approved a proposal Tuesday to relax restrictions on embryonic stem cell research.
Proposal 2 will allows people to donate embryos left over from fertility treatments, instead of discarding them as medical waste.
The vote was very close, with just 52 percent of voters supporting the measure.
Supporters say it could save lives and boost the state's economy, and that it builds upon federal restrictions
Opponents argued that passage of the proposal would lead to tax increases and unrestricted research.
Right now, Michigan state law considers the destruction of a human embryo a felony.