If they say that all human cells replace themselves every 7 years or so, why can scars remain on your body for the entire life?
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Because scars formed not only by cells, but also by fibrosis tissue, which is mostly formed by proteins between cells. Also, 7 years cycle is myth. Some cells live for days (like sperm), some for weeks (external layers of skin), some for months (red blood cells), some – for an entire life (neurons).
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