CD40 Protein, a vital TNFR superfamily member, lacks conserved residue(s) crucial for feature annotation propagation, indicating unique structural attributes. This distinctiveness may influence CD40s functional interactions within the TNFR superfamily, underscoring the need for further exploration to unravel its specific roles and regulatory mechanisms in cellular signaling pathways. CD40 Protein, Rhesus Macaque (HEK293, His) is the recombinant Rhesus Macaque-derived CD40 protein, expressed by HEK293 , with C-10*His labeled tag.