A proliferation-inducing ligand (APRIL), also known as TNFSF13, is a member of the tumor necrosis factor (TNF) ligand superfamily. APRIL/TNFSF13 has been shown to play a role in protecting cells from undergoing apoptosis and promoting B cell development. Mouse APRIL Recombinant Protein is purified APRIL (TNFSF13) produced in yeast.