Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Nail, general structure, SEM. Dr Thanuja Perera, U.Aberdeen. Source: Wellcome Collection.
![no text alternative](https://iiif.wellcomecollection.org/image/B0000674/full/800%2C/0/default.jpg)
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Nail, general structure, SEM. Dr Thanuja Perera, U.Aberdeen. Source: Wellcome Collection.