Thus , the regulation of the gene coding for the main T cell growth factor changes irreversibly after the first encounter of T cells with antigen .
thus , the regulation of the gene coding for the main t cell growth factor changes irreversibly after the first encounter of t cells with antigen .
O O O 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 O O O O O O O O O O O