CD40L/CD154/TRAP proteins stimulate T cell proliferation and cytokine production, acting as ligands for integrins and CD40 receptors to activate various cell-dependent effects such as B cell activation and NF-κ-B signaling. CD40L/CD154/TRAP Protein, Human (P. pastoris, His) is the recombinant human-derived CD40L/CD154/TRAP protein, expressed by P. pastoris , with N-6*His labeled tag.