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On “My hand was stabbed with a pencil tip 10 years ago - why is the graphite still visible?”
…any of the other pathogen receptors that macrophages have on their cell surface, they do not induce a transcriptional signal into the nucleus of the macrophage to induce it to chemotax out of the dermal tissue and into the lymphatic system, so they just sit there. The YouTube channel Smarter Every Day actually has two interesting videos on tattoos link to this video and link to this video.
Macrophages are long lived, so unless they receive transcriptional signals to get them to move out of the tissue they are in, they will just sit there, and if they happened to have engulfed the heavy metals in t……