What is mRNA? The messenger molecule that's been in every living cell for billions of years is the key ingredient in some COVID-19 vaccines
- Written by Penny Riggs, Associate Professor of Functional Genomics and Associate Vice President for Research, Texas A&M University

One surprising star of the coronavirus pandemic response has been the molecule called mRNA. It’s the key ingredient in the Pfizer and Moderna COVID-19 vaccines. But mRNA itself is not a new invention from...