p21ras is activated by the T cell antigen receptor ( TCR ) and then co-ordinates important signaling pathways for T lymphocyte activation .
p21ras is activated by the t cell antigen receptor ( tcr ) and then co-ordinates important signaling pathways for t lymphocyte activation .
B-protein_molecule O O O O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule O O O O O O O O B-protein_molecule I-protein_molecule O O