| http://www.w3.org/ns/prov#value | - 4-1BBL (also known as TNFSF9) is a member of the TNF-R superfamily, which includes OX40L, CD27L, CD40L, and GITRL (1). 4-1BBL is expressed primarily on antigen presenting cells, such as macrophages, dendritic cells, and B cells (2). 4-1BBL binds to 4-1BB on the surface of activated T cells (1). 4-1BBL/4-1BB binding activates the NF-??B pathway via TRAF1, 2, and 3 (1). 4-1BBL functions as a co-stim
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