The belly button, often overlooked, serves as a permanent record of an individual's origin and an evolutionary marker for the Eutheria lineage. Research has revealed that these recessed areas host a diverse and structured microbial ecosystem, with a significant portion of bacteria potentially unknown to science. This biome reflects evolutionary processes, with a few dominant bacterial types coexisting with numerous rare specialists, similar to tropical forests. AI
RANK_REASON The cluster describes a scientific study and its findings about microbial biodiversity in belly buttons, fitting the research category. [lever_c_demoted from research: ic=1 ai=0.0]
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