U. J. Alexander BioNTech (NASDAQ:BNTX) was already starting to gain some recognition for its pioneering work in mRNA technology when it signed an agreement with Pfizer (PFE) to develop a mRNA-based vaccine to prevent the flu in 2018. However, few knew at the time that the relationship would pave the way for another collaboration that would go on to produce the highest-selling pharmaceutical product in a single year, with $36.8 billion in 2021 sales, the COVID-19 vaccine. Pfizer describes how it and BioNTech ...