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These new reagents could provide a deeper understanding of the T cell repertoire.The uniquely hollow structure of microtubules (MTs) confers characteristic mechanical and biological properties. Although most regulatory processes take place at the outer surface, molecular events inside MTs, such as α-tubulin acetylation, also play a critical role. However, how regulatory proteins reach the site of action remains obscure. To assess luminal accessibility, we first identified luminally positioned residues of β-tubulin that can be fused to