We generated various CTL lines that recognize epitopes derived from vaccinia virus-expressed antigens. Late antigens, in contrast to early antigens, could not activate CTL by direct presentation as well as by cross presentation. Distinct availability of early and late antigens for MHC I presentation was not due to the impairment of the antigen presentation machinery, but due to different subcellular localization of these antigens. As a result, timing of viral antigen production and localization to specific cell compartments play an important role for processing recMVA antigens.
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We generated various CTL lines that recognize epitopes derived from vaccinia virus-expressed antigens. Late antigens, in contrast to early antigens, could not activate CTL by direct presentation as well as by cross presentation. Distinct availability of early and late antigens for MHC I presentation was not due to the impairment of the antigen presentation machinery, but due to different subcellular localization of these antigens. As a result, timing of viral antigen production and localization...
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