This view represents ZF2-ZF4 captured in the inner surface of importin beta. There are 15 residues of Snail1 that are present during the intramolecular interaction with importin beta: four are in ZF2(orange), four are in ZF3, and three in ZF4(yellow). ZF2-ZF4 are wound in a ball for the compact and tight interaction with importin beta. In ZF3(pink), the alpha helix of ZF3 is arranged with the inner alpha helix of HEAT6 from the importin B, which stabilizes the complex formation.