Cluster of differentiation 40, CD40 (also known TNFRSF5, Tumor necrosis factor receptor superfamily member 5.) is a costimulatory protein and expresses on antigen presenting cells (APC). In human, CD40 is coded by TNFRSF5 gene and has 7 transcripts. Its ligand, CD154 (CD40L), is a protein that is primarily expressed on activated T cells and is ...
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