Even if trace amounts are found, they are no longer functional [0]. And it’s important to consider the percent of dosage when looking at biodistribution post injection, not just the amount of lipids [3], so it’s really much less significant amounts found outside the site of injection. Most is taken care of via hepatic clearance.
UTR sequences, which regulate transcription and sub cellular localization, can be tailored for specific cell types [1].
There is no evidence of spike protein toxicity [2]. And while the covid spike protein has potential to cause damage for example to the cells lining the small vessels of the heart following infection, there is no evidence that this is also the case with vaccinations [4]
[0] https://www.ncbi.nlm.nih.gov/books/NBK565969/
[1] https://jamanetwork.com/journals/jamapediatrics/fullarticle/...
[2] https://www.reuters.com/article/factcheck-vaccine-safe-idUSL...
[3] https://medium.com/microbial-instincts/biodistribution-and-s...
[4] https://www.bhf.org.uk/what-we-do/news-from-the-bhf/news-arc...