4-1BB LigandAntigens, CD137LigandsReceptors, Nerve Growth FactorTumor Necrosis FactorsRecombinant ProteinsReceptors, Tumor Necrosis FactorRats, Inbred BBAntigens, CDAntigens, CD28Antigens, CD80Lymphocyte ActivationMice, Inbred C57BLT-LymphocytesMolecular Sequence DataTumor Necrosis Factor-alphaRecombinant Fusion ProteinsAmino Acid SequenceCD40 LigandDNA, RecombinantCloning, MolecularFas Ligand Protein