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COMMENTARY |
CORRESPONDENCE N.M-O.: nmorozco{at}mdanderson.org OR C.D.: cdong{at}mdanderson.org
Abstract
Costimulation regulates the activation of naive T cells as they first encounter antigens in the secondary lymphoid organs. But recently characterized costimulatory molecules of the B7 family appear to have roles beyond initial T cell activation. New evidence shows that negative costimulators expressed by tumors and normal tissues afford local protection from T cellmediated attack.
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