T lymphocytes need less than 3 min to discriminate between peptide MHCs with similar TCR-binding parameters.

As shown in Table 1 , the pMHCs that induced higher contact areas also induced more rapid initial spreading, although the initial spreading rate displayed only 1.8-fold variation depending on stimulation peptide, but peptide discrimination remained highly significant ( p = 1.3 × 10 −16 ).

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