there has to be a selector that finds the right cell, and a breacher, which opens the cell membrane.
it's possible they are using a hybrid technique with a passive breacher that creates an open socket with an enzyme style matcher that positions the breacher, but it's more likely it's just a plain old lung virus of some kind they use to deliver it with, one that is extremely rare so the chances are very few people are immune and won't have the mRNA penetrate ze cells.
i hope i don't have to remind you that any "official" papers on this frankenmedicine are going to be as credible as the old "cigarettes are safe" and "asbestos is safe" studies. or like the one that "oops" they accidentally gave the rats meth instead of mdma. but the media ran with the "mdma is neurotoxic" story anyhow, even though both meth and mdma can cause neurotoxixcity via hyperthermia and stroke (similar to benzo withdrawal and epilepsy).