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Nonmetric multidimensional scaling analysis of OTU-based bacterial 16S rRNA gene sequence abundances in individual pig intestinal samples. Environmental variables are plotted as vectors. The length of each vector is arbitrarily scaled, so only their directions and relative lengths should be considered. Lumen samples are solid and mucosal samples are outlined. Diamond, ileum; triangle, cecum; square, colon; and circle, feces.
