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The distribution of the 16,312 genes included in this study with respect to expression definition. Epi-expressed: the number of genes expressed in the epididymis. Epi-selective: the number of genes that were mostly expressed in the epididymis compared with 22 other tissues. Epi-exclusive: the number of genes that were only expressed in the epididymis compared with 22 other tissues. Segmentally regulated: the number of genes that were mostly expressed in one or a few epididymal segments.
