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Three years later, Californians are still waiting for some results. Until recently, most of the money was tied up in lawsuits. And even now that the tap is flowing, proponents acknowledge it could take years, if not decades, for the grants to pay off.
"It's too early," said Alan Trounson, president of the California Institute for Regenerative Medicine, the agency charged with administering the stem cell funds. "There are very few substantial developments [in medical science] that have happened in less than 25 years. There have been some, but they tend to be rare."
The slow rate of progress serves as a reality check for Massachusetts and other states that have followed California's lead by placing big...