Abstract
Data presented in this paper suggest that there may be two alternative pathways which T lymphocytes can use in generating a cytotoxic response to alloantigens in vitro. First, there is the pathway taken when stimulator and responder cells differ by an entire H-2 complex where Ly1+2- helper T lymphocytes respond to I region encoded lymphocyte defined differences and provide help to the Ly1-2+ cytotoxic T lymphocytes responsive primarily to K/D region encoded cytotoxicity defined determinants. Second, there is the pathway taken when stimulator and responder cells differ by only K or D region differences without an I region encoded difference; under these conditions, an Ly1+2+ cell, which does not appear to play a significant role in the development of a cytotoxic response to an entire H-2 difference, appears to play a pivotal role.
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Selected References
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