CD40 Ligand (CD40LG) is a transmembrane protein that is a member of the TNF superfamily. In addition to existing in a membrane bound form, CD40LG can also be released as a soluble molecule (sCD40LG), which has been shown to have biological functions.CD40 interacts with CD40 ligand (aka CD40LG, TNFSF5 or CD154), which is predominantly expressed on activated CD4 T-cells. Canine CD40 Ligand Recombinant Protein is purified CD40LG produced in yeast.