We examine the structural and functional classifications of the protein universe, providing an overview of the existing classification schemes, their features and inter-relationships. We argue ...

Astrid E. Lammers 1, Ian Adatia 2, Maria Jesus del Cerro 3, Gabriel Diaz 4, Alexandra Heath Freudenthal 5, Franz Freudenthal 5, S. Harikrishnan 6, Dunbar Ivy 7, Antonio A. Lopes 8, J. Usha Raj 9, ...