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(a) Similar enrichment terms related to the positively selected genes for adaptation to hypoxia in the four branches of subterranean mammals. (b) Comparison of the percentages of expanded gene families related to adaptation to hypoxia in the four branches of subterranean mammals. Each color represents a subterranean branch. Notes: (a) Histogram represents the count of the terms, and the black dot represents the p value. (b) Histogram represents the percentage of expanded gene families
