Therefore , costimulation by alpha 4 beta 1 ligands was not due to stabilization of the interaction of the cells with its substrate .
therefore , costimulation by alpha 4 beta 1 ligands was not due to stabilization of the interaction of the cells with its substrate .
O O O O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O O O O O O O O O O O O O O O O