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Medical Term:

accessory molecules


surface receptors on immune cells, which participate in cell-cell interactions and modulate the immunologic outcome. For example, in T-cell recognition of B-cell presented–antigen, the primary interaction occurs through CD3-CD4 binding to MHC and antigen, but this interaction is amplified if concomitant accessory molecule binding also occurs, CD28 to B7.

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.