\bˌiːbˈiː wˈɒn], \bˌiːbˈiː wˈɒn], \b_ˌiː_b_ˈiː w_ˈɒ_n]\
Definitions of BB 1
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The natural ligand for the T-cell antigen CD28; (ANTIGENS, CD28); mediating T- and B-cell adhesion. CD80 is expressed on activated B-cells and gamma-interferon-stimulated monocytes. The binding of CD80 to CD28 and CTLA-4 provides a co-stimulatory signal to T-cells and leads to greatly upregulated lymphokine production.
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