How come scarring persist when cells renew?

This week’s Quirks Question involves us from Sandra Pilgrim, who asks: 

“If our cells are continually renewing themselves, how come scarring from injuries or surgery persist?”

To reply to this, we arrived at Dr. Saeid Amini Nik, an assistant professor within the Department of Surgery in the College of Toronto, as well as works together with Sunnybrook Hospital’s Trauma, Emergency and demanding Care Program.

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