Vaccines Grown in Lettuce?

A recent project in California, funded by a $500,000 grant from the National Science Foundation, involves growing lettuce producing mRNA vaccines

https://childrenshealthdefense.org/defender/thomas-massie-fda-usda-transgenic-edible-vaccines/

Rep. Thomas Massie (R-Ky.), who introduced the amendment, said he is concerned “we could really contaminate a lot of our food supply with unknown doses of vaccines that would deliver unknown dosages.”