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We examine the fundamental properties of the human na\u00efve TCR repertoire through the perspective of Diversity, Equality, and Inclusion. We first consider the richness of the repertoire. A combination of experimental and computational approaches has been used to estimate that the human repertoire contains at least 100 million distinct na\u00efve clonotypes. This estimate suggests an average size of each clonotype of 1000\u2009T cells. However, evidence from both mathematical modeling and large\u2010scale single\u2010cell sequencing indicates that clonotype family sizes are very unequal, with a small subset of na\u00efve TCRs present at substantially higher frequencies. Somatic recombination itself does not contribute significantly to this inequality, as the probability of generating an identical clonotype multiple times in an individual is very small. Instead, clonotype size is likely to be largely driven by thymic or post\u2010thymic expansion, but the mechanisms driving heterogeneity remain poorly understood. Finally, despite clonal deletion being a cornerstone of immunological dogma, experimental evidence for functional \u201choles\u201d in the na\u00efve repertoire caused by negative thymic selection is surprisingly limited. Alternative tolerance mechanisms, including regulatory T cells and T cell quorum sensing, are likely to play important roles. This review highlights the need for further research to identify the mechanisms that shape the frequency distribution of na\u00efve TCR clone sizes and to define its impact on primary immune responses. Further research is also needed to understand the role of quorum sensing in maintaining T cell tolerance, while avoiding potential vulnerabilities arising from extensive \u2018holes\u2019 in the TCR repertoire.<\/jats:p>","DOI":"10.1111\/imr.70138","type":"journal-article","created":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T20:44:54Z","timestamp":1782938694000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Diversity, Equality, and Inclusion in the na\u00efve T Cell Receptor Repertoire"],"prefix":"10.1111","volume":"340","author":[{"given":"Isabella","family":"Sodi","sequence":"first","affiliation":[{"name":"Institute of Infection, Immunity, and Transplantation UCL  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew V.","family":"Cowley","sequence":"additional","affiliation":[{"name":"Institute of Infection, Immunity, and Transplantation UCL  London 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