Scientists Spawn Human-Pig ‘Chimeras’
Some animals are more equal than others. California scientists have engineered human-pig hybrids, injecting human stem cells into pig embryos to develop for a trimester in surrogate sows. The goal is to create pigs with a few human cells, paving the way for animals to grow specific human organs for transplants. Though the experiment could be a game-changer for organ donation and medical testing, skeptics have serious ethical concerns, from chimeras accidentally mixing with wild populations to the idea of subjugated pigs with humanized brains … perhaps inciting farmyard unrest.