A<unk> is a claw-like plate at the tip of the fingers and toes in most primates.<unk>  correspond to claws found in other animals. Fingernails and toenails are made of a tough protective protein called alpha-keratin, which is a polymer. Alpha-keratin is found in the hooves, claws and horns of vertebrates.
Nail 
Labdoor
Syringe
Caul
Xilloc
Drustbed
Crown 
Dreamlab