Why is the mRNA not damaged at -70 C temperature Corona vaccine?
Actually they use Sucrose as cryoprotectant.
As was observed (by others) under related q's here on material from that site, it seems Pfzier/BioNTech has done a global optimization to increase CG contents in the sequence, generally thought to be beneficial to mRNA expression (in addition to all the other things they've done, like U -> m1Ψ global substitution, specific to mRNA therapeutics).
The two stop codons are obviously to prevent read-through of the termination codon. Why this should be necessary is not clear to me, but the following may be relevant:
The synthetic mRNA differs from the natural mRNA in a particular respect that is easier to explain with reference to the transcript map of the virus, below.
The two ORFs 1a and 1b are ...
Answering my own question after reading the 2018 Nature review article “mRNA vaccines — a new era
The resources and motivation engendered by the COVID-19 pandemic are a major factor in the development of the first mRNA vaccines approved by national governments. However, before the COVID-19 pandemic, there were recent advances in mRNA vaccine ...