DensityFit combines a low-resolution electronic density map for a protein (usually obtained by electron microscopy) and an atomic-resolution structure (usually obtained by X-ray crystallography) of the same protein in a different conformation in order to predict the atomic-resolution structure of the conformation described by the density map.
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K Hinsen, N Reuter, J Navaza, D L Stokes, and J J Lacapere
Normal mode based fitting of atomic structure into electron density maps:application to SR Ca-ATPase
Biophys. J. 88:818-827 (2005)