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. Author manuscript; available in PMC: 2013 Mar 21.
Published in final edited form as: Am J Obstet Gynecol. 2010 May;202(5):431.e1–431.34. doi: 10.1016/j.ajog.2010.03.026

Figure 1.

Figure 1

STRUCTURE116 analysis of spontaneous preterm labor/delivery with intact membranes samples to detect population stratification. A) Each mother is denoted as a character with cases in RED and controls in GREEN. Also included are samples from HapMap (Phase 3). These samples are the European (CEU) (BLUE) and Asian samples (Chinese and Japanese, YELLOW) to test the hypothesis of population stratification. Clustering at the vertices indicate genetic similarity and little stratification. The samples from Chile cluster within the space defined by the European samples, supporting the hypotheses of little or no genetic stratification. B) The same analyses conducted with fetal samples included in the current study using the criteria and color coding as in (A). As with the maternal there is no evidence of substantial population stratification.