The CATH Database provides insights into protein structure/function relationships.

per Orengo, C A, Pearl, F M, Bray, J E, Todd, A E, Martin, A C, Lo Conte, L, Thornton, J M
Publicat 1999

The CATH database: an extended protein family resource for structural and functional genomics

per Pearl, F. M. G., Bennett, C. F., Bray, J. E., Harrison, A. P., Martin, N., Shepherd, A., Sillitoe, I., Thornton, J., Orengo, C. A.
Publicat 2003