The mRNA is a piece of artificial genetic code embedded in (graphene) nanoparticles that cause your cells to produce spike proteins which mimic virus attack. When the immune system detects the spike proteins, it will mount an attack, and so triggers the production of antibodies. The lipids wrapping the mRNA nanoparticles contain polyethylene glycol (PEG) for the purpose of evading the body’s innate immune system. When artificial mRNA gets into the cells, it hijacks the original genetic codes from the DNA and modifies it. The modified genetic codes are then translated to the ribosomes for making spike proteins which mimics the COVID19 virus, and that in turn cause the immune system to mount an immunological attack triggering the production of antibodies. That is the basic idea behind COVID19 mRNA vaccines. However, the problem is that lipid nanoparticles can travel everywhere in the body, including the heart, the brain, and even the reproductive organs. So, spike proteins are found everywhere in the body, causing blood clots to form in places where they are found. The immune system attacks the spike proteins and cause blood clots to form.