Yet , for many pathogens , the molecules that induce IL-12 production by macrophages and the mechanisms by which they do so remain undefined .
yet , for many pathogens , the molecules that induce il-12 production by macrophages and the mechanisms by which they do so remain undefined .
O O O O O O O O O O B-protein_molecule O O B-cell_type O O O O O O O O O O O