“Can you tell me the antigen that the mRNA injections are using? I can’t find what they are.”
Portions of the Spike Protein. That’s been mentioned in most every description of the vaccines. But here’s one more:
https://www.nature.com/articles/s41541-021-00369-6
“They all rely on the native viral spike protein (S) of SARS-CoV-2 for inducing potently neutralizing antibodies, but the presentation of this key antigen to the immune system differs substantially between the different categories of vaccines. “
And here’s a preview of how covid vaccines will change as more is being learned about the virus:
The antigen is not in the mRNA vaccine. It only has the RNA blueprint for the antigen, which is the Spike Protein that is constructed by the ribosomes when they create a protein strand of the Spike Protein. That protein strand is broken up and presented on the the host cell’s membrane where they bind to the MHC-1 and MHC-2 complex molecule. Other cells called helper T-cells detect these antegen fragments. The helper T-
cells can raise the alarm and help marshal other immune cells to fight the infection whenever it invades the body.