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Date Time Synthetic “micro lungs” could take COVID-19 research to next level 3D cell cultures resembling lung buds. In the real embryo, the green cells would give rise to airways while the red cells would become alveoli. When SARS-CoV-2 began its furious spread around the globe, it took scientists only a few months to develop the first tools to study or neutralize the virus. What’s been missing until now, however, are reliable methods to pinpoint the disease-not the pathogen per se, but the complex biological events playing out inside infected human cells and tissues. Research aimed to understand how COVID-19 wreaks havoc in the lungs, for example, has often been done with miscellaneous lung cancer cells that show crucial differences with the cells targeted by the virus.