Ankyrin Repeat Domain

Ankyrin repeat domain of Bcl-3.

"The ankyrin repeat is a 33-residue motif in proteins consisting of two alpha helices separated by loops, first discovered in signaling proteins in yeast Cdc10 and Drosophila Notch. Domains consisting of ankyrin repeats mediate protein-protein interactions and are among the most common structural motifs in known proteins."
--http://en.wikipedia.org/wiki/Ankyrin_repeat

Model of based on the Protein Data Bank entry 1K1A:
http://www.rcsb.org/pdb/expl