Repeat

Structures: Intron encoded nuclease repeat (IPR003647)

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.

1u3e 

CATH

CATH is a hierarchical classification of protein model structures.

1.10.10.10 

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.

d.285.1.1