The two related protein- tyrosine kinases Syk and Zap are rapidly phosphorylated on tyrosine residues and enzymatically activated upon crosslinking of the T cell antigen receptor .
the two related protein- tyrosine kinases syk and zap are rapidly phosphorylated on tyrosine residues and enzymatically activated upon crosslinking of the t cell antigen receptor .
O O O B-protein_family_or_group B-amino_acid_monomer O B-protein_molecule O B-protein_molecule O O O O B-amino_acid_monomer O O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O