SCOP - Structural Classification of Proteins

Hierarchical levels of Tyrosine Kinase searched using SCOP.  The unit of categorization or hierarchy of importance is bolded.

The families consist of proteins that share a very common evolutionary origin,  superfamilies consist of families that share a common structure and function. The folds are superfamilies that share the core protein structure.

Root: scop
Class: All beta proteins
Fold: SH3-like barrel
barrel, partly opened; n*=4, S*=8; meander
the last strand is interrupted by a turn of 3-10 helix
Superfamily: SH3-domain
Family: SH3-domain
Protein: c-src protein tyrosine kinase
Species: Human (Homo sapiens)

Here is the direct link from SCOP