Figure 4.

Principal coordinate analysis. Unifrac PCA analysis of the eight clone libraries. First principal component (P1) represents the season and P3 represents the building. 1, Building 1; 2, Building 2; W, winter; Sp, spring; Su, summer; F, fall.

Rintala et al. BMC Microbiology 2008 8:56   doi:10.1186/1471-2180-8-56
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