I can tell you for sure that the amino acid content isn't changed in any obscure way - it's exactly the original Wuhan genome's spike protein, with two proline

I can tell you for sure that the amino acid content isn't changed in any obscure way - it's exactly the original Wuhan genome's spike protein, with two proline mutations that put it in a prefusion conformation that makes a more stable target for antibodies, a strategy developed in research for SARS/MERS vaccines. The codons and overall RNA sequence are heavily optimized in ways that outsiders and I suspect they companies themselves don't really understand. Pfizer's production version of BNT162b2 is actually BNT162b2 V9, suggesting they tried combinations of many different strategies and took the one that worked the best. You could be right that some of the optimizations had immune effects that no one knows or understands yet, but I doubt there was real intention behind it. Magic sauce indeed! The sequence is actually public, but as far as I know no one has figured out what optimizations worked in the end aside from the uracil-depletion + 1-methylpseudouridine trick to avoid an immune response to what looks like viral RNA. https://mednet-communities.net/inn/db/media/docs/11889.doc https://mednet-communities.net/inn/db/media/docs/11889.doc