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MHC-peptide complexes and ICAM-1 are laterally mobile on APCs (10, 36). Regulation of lateral mobility of MHC-peptide complexes by cytoskeletal interactions augments some T cell responses, but is not essential for T cell activation (36).
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+, which were depleted here, or double-negative cells, and both populations expressed the clonotypic TCR.
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Proliferation of CD4-negative 3L2 T cells on planar bilayer was less than one-tenth that obtained with CD4-positive 3L.2 T cells.
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We thank R. Houdei for technical assistance and N. Desai for advice on imaging and data analysis; D. Donermeyer for generation of the 3.12 TCR transgenic mouse lacking CD4; E. Unanue for inspiring our efforts; E. Elson for help with FPR and the loan of the argon ion lasen J. Heuser and H. Hiyakawa for single-particle imaging; A. Chan, C. Kersh, M. Thomas, E. Unanue, and H. Virgin for critical reading of the manuscript; and J. Smith for final preparation of the manuscript. Supported by grants from the Whitaker Foundation (M.L.D.), the Arthritis Foundation (M.L.D.), the Howard Hughes Medical Institute (M.M.D.), and the NIH (M.L.D., M.M.D., P.M.A, and A.S.S.).
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