Although CD40 lacks intrinsic tyrosine kinase activity , its ligation induces protein tyrosine phosphorylation , which is necessary for several CD40 -mediated events .
although cd40 lacks intrinsic tyrosine kinase activity , its ligation induces protein tyrosine phosphorylation , which is necessary for several cd40 -mediated events .
O B-protein_molecule O O O O O O O O O B-other_name B-amino_acid_monomer O O O O O O O B-protein_molecule O O O