Cluster dendrogram illustrating the degree of relatedness between microbiota isolated from individual subjects. Individual subjects (x axis) were assigned a numerical designation (#) as a function of genotype (for both genotypes, n = 21 mice). The similarity (%) (y axis) of the microbiota between individual subjects is based on an index of TRF presence/absence binary data. Individual mice are represented as follows: ○, 8604-fed ERβ+/+ mice; , 8604-fed ERβ−/− mice; ●, AIN-76-fed ERβ+/+ mice; , AIN-76-fed ERβ−/− mice.