Methods Skin tissue specimens were harvested from the corresponding sites from 6 healthy volunteers and from scar tissue of 6 patients 1 year after major deep burn.

方法取6例大面积深度烧伤患者伤后1年的增生性瘢痕组织，另取6例健康志愿者对应部位的全层皮肤。

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Unlike human fishing techniques, which tend not to discriminate between sick and healthy specimens, sharks are selective: they target weakened prey, thereby keeping fish populations healthy and strengthening the gene pool.

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