In November, Missouri voters will decide the future of embryonic stem cell research in the state.

Until then, both sides of the debate are making their case in TV commercials.

Supporters of embryonic stem cell research said obtaining human eggs is “uncomfortable and exhausting.” One supporter compared it to bone marrow extraction, but said it is necessary. The most plentiful source of the needed cells is from a fertilized egg.

Stem cell boosters said there are side effects from the drug some donors take to produce more eggs. In a few cases, women have died.

The American Society for Reproductive Medicine said one-half of 1 percent of all egg donors suffer the most common ailment, which is ovarian hyperstimulation.

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