Domain

Structures: STAT transcription factor, protein interaction (IPR013799)

PDBe

The Protein Data Bank (PDB) is a repository for the 3-D structural data of large biological molecules, such as proteins and nucleic acids.

1bgf  1yvl 

CATH

CATH is a hierarchical classification of protein model structures.

1.10.532.10 

SCOP

The Structural Classification of Proteins (SCOP) database is a largely manual classification of protein structural domains based on similarities of their amino acid sequences and three-dimensional structures.

a.90.1.1