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. 1998 Oct 19;188(8):1473–1484. doi: 10.1084/jem.188.8.1473

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T cell proliferation in response to B cells (open circles) or DCs ( filled triangles) presenting different numbers (nb) of peptide–MHC complexes. The T to APC ratio is 1:6 with B cells and 1:1 with DCs.