Real time structural search of the Protein Data Bank
Fig 1
Electron density decomposition into 3D Zernike moments, using human deoxyhaemoglobin (PDB ID 4HHB).
Top Layer: values of weighted 3D Zernike functions of order n in gradient from red (negative) to blue (positive). Bottom Layer: reconstruction of order n obtained by summation of all values up to order n (only positive density is shown).