Importantly , it was also present in the nucleus of HeLa cells , which lack HNF1 , and in the cytoplasm of fibroblasts that have little or no tetrahydrobiopterin .
importantly , it was also present in the nucleus of hela cells , which lack hnf1 , and in the cytoplasm of fibroblasts that have little or no tetrahydrobiopterin .
O O O O O O O O O O B-cell_line I-cell_line O O O B-protein_molecule O O O O B-cell_component O B-cell_type O O O O O B-protein_molecule O