Creation of Chimeric Embryos (Human-Animal Hybrids): Scientists have created embryos combining human and animal cells (chimeras) to study development and grow human organs for transplant. Using CRISPR, human stem cells are injected into animal embryos, like pigs or monkeys. This research sparked ethical outrage over the moral status of such entities and fears of humanized animals. Critics worry about human cells contributing to animal brains or gametes, blurring species boundaries. Some experiments were conducted with limited public oversight. The scandal involves crossing perceived natural and ethical lines, raising "yuck factor" concerns and demands for stricter guidelines. While potentially life-saving, this research challenges definitions of humanity and requires careful ethical and regulatory frameworks to prevent public backlash and ensure responsible science.
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