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General pathology and immunology

Wound healing, fibrosis, and scar formation

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SAMPLE QUESTION

Two adjacent areas of skin are injured. Both have viable epithelial cells capable of proliferation, comparable perfusion, and adequate nutritional support. Neither is infected. In one area, the basement membrane is largely preserved and the surface is restored with little residual scar. In the other, the supporting architecture is extensively destroyed and collagen-rich tissue fills the defect.

Which of the following differences most directly explains the repair outcomes?