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keloids
A raised formation of
fibrous scar tissue caused by excessive tissue repair in response to
trauma or surgical incision.
keratin
A tough, insoluble protein
substance that is the chief structural constituent of skin, hair and
nails, produced by the epidermis. Hard keratin forms hair and nails,
while soft keratin forms the fine scaling on the skin surface.
Kilohertz (KHz)
1,000 cycles per second.
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