Abstract
2B4 (CD244) is a member of the CD2 subset of the Ig superfamily. This molecule is expressed on innate immune cells, including NK cells, and on subsets of T cells. The 2B4 molecule interacts with CD48, which is widely expressed on hemopoietic cells. Although earlier reports demonstrated a role for 2B4 as an activating receptor in both mice and humans, recent studies of 2B4-deficient mice have suggested that 2B4 functions predominantly as an inhibitory receptor in mice. In addition, 2B4 may also act as a costimulatory ligand for cells expressing CD48. Thus, the 2B4 molecule is more multifunctional than previously understood. In this study, we delineate the current view of 2B4-CD48 interactions among lymphocytes and other cells.
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