<em>keratin is a fibrous protein that has protective and structural functions in the body. </em>
<em>to fulfil it's functional necessities keratin has characteristics that makes it insoluble and repellent to damage.</em>
<em>to fulfil it's functional necessities keratin has characteristics that makes it insoluble and repellent to damage.in the human body, keratin can be present in - hair and finger nails. </em>