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Figure 14
Density-modification techniques. (a) Solvent flattening uses automated methods to define the protein–solvent boundary and then modifies the solvent electron density to be a certain fixed value. (b) Histogram matching redefines the values of electron-density points in a map so that they conform to an expected distribution of electron-density values. (c) Noncrystallographic (NCS) symmetry averaging imposes identical electron-density values to points related by local symmetry, in this case a trimer of ducks that forms the asymmetric unit. The local NCS symmetry operators relating points in duck A to ducks B and C are shown.

Journal logoSTRUCTURAL
BIOLOGY
ISSN: 2059-7983
Volume 66| Part 4| April 2010| Pages 325-338
https://doi.org/10.1107/S0907444910006694
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