International
Tables for
Crystallography
Volume F
Crystallography of biological macromolecules
Edited by M. G. Rossmann and E. Arnold

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. F. ch. 12.2, p. 257   | 1 | 2 |

Figure 12.2.2.1 

M. T. Stubbsa* and R. Huberb

a Institut für Pharmazeutische Chemie der Philipps-Universität Marburg, Marbacher Weg 6, D-35032 Marburg, Germany, and bMax-Planck-Institut für Biochemie, 82152 Martinsried, Germany
Correspondence e-mail:  stubbs@mailer.uni-marburg.de

[Figure 12.2.2.1]
Figure 12.2.2.1

The Patterson map with symmetry. When the crystal unit cell contains more than one molecule, then additional cross vectors will be formed between differing molecules. If these are related by crystallographic symmetry, there is a geometrical relationship between cross peaks. In this diagram, the peaks of Fig. 12.2.1.1[link] are supplemented by those between atoms of symmetry-related molecules. The red, yellow and blue peaks of the resulting Patterson function represent those between same atoms (i.e. red to red, yellow to yellow and blue to blue) related by symmetry. These peaks are found on a Harker section.