Underdeveloped human tissues can help save the living MARIANNE MEANS Syndicated columnist Washington- The political struggle over abortion intrudes once again on an issue crucial to the health of millions of Americans, pitting reverence for undevel- oped , unborn human tissue against potential advances in medical treatment for living men, women and children. In this case it is not the mental and physical well-being of a pregnant woman that is endangered but that of victims suffering from Parkinson's and Alzheimer's diseases, diabetes and other serious illnesses. Where should compassion lie? With inanimate, non-breathing embryonic stem cells or disabled and sick friends and family members needing medical help? No contest, I say. Save the living. Scientific evidence indicates that biomedical research on human embryonic stem cells could lead to remedies for all sorts of life-threatening human afflictions not now curable. Scientists do not consider the cells themselves to be embryos because they can be extracted and isolated and have not yet grown into the specialized matter that makes up muscles, nerves, blood and organs. The potential for unprecedented medical miracles by replacing diseased tissue with stem cells is astonishing. But anti-abortion activists don't care about reality. They equate the cells with an intact, full-term fetus and demand the same legal rights for the cells as those granted a living person. "Stem cell research is immoral," thunders Sen. Sam Brownback, R-Kan, a leading anti-abortion crusader. Sen. Arlen Specter,R-Pa, and Tom Harkin, D-Iowa, define dignity and morality differently. They say that stem cell research hold so much potential that "it is morally wrong" to keep scientists from pursing it. Their priority is in giving millions in pain the chance for a life-saving cure. Caught in the emotional clamor are federal regulations, issued in August, that require all stem cell research to be conducted under strict ethical guidelines. Under the rules, the microscopic clumps of cells must come from embryos created in clinics for fertility treatment, and are due to be discarded because they are no longer needed. Extra embryos are often created for multiple in-vitro pregnancies attempts.