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T cell activation is predicated on the interaction between the T cell receptor and peptide-major histocompatibility (pMHC) ligands. The factors that determine the stimulatory potency of a pMHC molecule remain unclear. We describe results showing that a peptide exhibiting many hallmarks of a weak agonist stimulates T cells to proliferate more than the wild-type agonist ligand. An in silico approach...
The coordination of T-cell migration and antigen recognition is crucial for an effective immune response. We have proposed that this coordination is achieved by formation of an immunological synapse between the T cell and the antigen-presenting cell (APC). Our view contrasts with the serial encounter model also proposed in this issue of Trends in Immunology, which is based on transient T cell-APC...
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