Physicians identified the growth as a "cutaneous horn," made of compacted keratin, the same protein found in human nails and hair. The exact cause of cutaneous horns is not well understood ...

Horns, says Gilbert Myers, assistant curator at the National Zoo, consist of bone encased in the protein keratin, which is also found in human fingernails. Horns are generally permanent ...

The growth - called a sebaceous horn - is understood to be made of keratin, found in toenails and human hair. Neurosurgeons at Bhagyoday Tirth Hospital in Sagar city, India, removed the lump ...

Keratin is a fibrous protein produced naturally by many animals—it forms the main structural constituent of body parts such ...