Researchers at Israel’s Technion Institute have discovered a unique genetic mechanism that provides cells with rapid protection against viruses. Normally, molecules NORAD and STAT3 control the immune system. On virus attack, the cells eat NORAD, and STAT3 unleashes an immune response.
https://www.technion.ac.il/en/blog/article/viruses-and-the-human-cell-the-evolutionary-arms-race/