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Putting human brain cells into animals should receive special attention from the ethics panel that approves animal experiments, the report says. And scientists should look for better ways to measure the effects of such cells on the recipients' behavior.
German Basic Law, which functions as the country's constitution, states that "human dignity is inviolable," and the report delves deeply into the philosophical issues that arise when experiments mix animal and human cells or genes: How to define what is human, what counts as "animal," and whether mixing the two violates the dignity of either one. The report's...