Inside a fortresslike megafarm on the outskirts of Beijing, dozens of pink and black pigs forage and snooze, unfazed by the chilly spring air. These experimentally bred hogs are fortified with a gene for regulating heat, buffering them against northern China’s hypothermia-inducing winters.The gene that researcher Jianguo inserted into the pigs’ DNA is among dozens of examples of genetic engineering underway in China – and in rival laboratories across the world – to create super pigs. For years,…



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