She and a partner developed and refined the mRNA technology that eventually led to the Covid-19 vaccines made by Pfizer and Moderna. It took decades of other scientists telling her that she was wasting her time, that what she was working on was useless, but she wouldn't give up. She worked on the idea tirelessly for about 40 years.
http://www.nytimes.com/2021/04/08/health/coronavirus-mrna-kariko.html
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