Fig. 1

Repeat proteins are formed with tandem arrays of repeats. The crystal structures of members of different repeat protein families are shown, with the backbone colored according to the repeated units. The molecular surface of the repeat array is drawn in transparent gray. a ANK family (PDB:1IKN, chain D), b WD40 family (PDB:1ERJ, chain A), c TPR family (PDB:4GCO), d LRR family (PDB:4NKH, chain A), e ANEX family (PDB:2ZOC, chain A), f PUF family (PDB:2YJY, chain A), g HEAT family (PDB:4G3A, chain A), and h ARM family (PDB:2BCT)