CD137, also known as 4-1BB, is a protein that exhibits defects in conserved residues required for feature annotation propagation. Specific residues missing in CD137 prevent the propagation of certain functional features associated with this protein. CD137/4-1BB Protein, Rhesus Macaque (Biotinylated, HEK293, His) is the recombinant Rhesus Macaque-derived CD137/4-1BB protein, expressed by HEK293 , with C-His labeled tag.