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The city government of Chengdu said the vaccine will enter a clinical trial after positive results were shown. SHOW TRANSCRIPT China has approved human trials for a coronavirus vaccine — developed using cells of insects to help grow potential disease-blocking proteins. The city government of Chengdu said on China's social media service WeChat that the vaccine will enter a clinical trial for humans after positive results were shown in tests on monkeys. The local government said the vaccine prevented COVID-19 infection — with no apparent side effects — for monkeys. It was developed by growing proteins in insect cells, a...