STRUCTURE is one of the Softwares that assign individuals to populations using genotype data. It is most widely used clustering software applied to cluster individual into groups.
For more detail, please read following article:
1. Pritchard, Jonathan K., William Wen, and Daniel Falush. "Documentation for STRUCTURE software: Version 2." (2003).
2. Earl, Dent A. "STRUCTURE HARVESTER: a website and program for visualizing STRUCTURE output and implementing the Evanno method." Conservation genetics resources 4.2 (2012): 359-361.
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