It felt like the mRNA took hold in both my arm, _and_ my heart. Which given the proximity and paths between, is not entirely surprising.

It felt like the vaccine entered my bloodstream and was taken up, in part, by the heart. Which then started making spike protein and soliciting an immune response.

I'd really love to learn more about this, but haven't been able to find any good resources. If anyone can point me in the right direction, I'm all ears!