This gene represents read-through transcription between neighboring genes encoding tumor necrosis factor family members. This results a hybrid protein composed of the cytoplasmic and transmembrane domains of family member 12 fused to the C-terminal domain of family member 13. The homologous fusion protein in human is known to be membrane-anchored and presents the receptor-binding domain of family member 13 at the cell surface. It stimulates cycling in T- and B-lymphoma cell lines. Alternative splicing of this mouse gene results in multiple transcript variants. [provided by RefSeq, Oct 2010]