tokens: However , in differentiating erythroid cells , which must incorporate high levels of iron to sustain hemoglobin synthesis , and in macrophages , which are involved in iron storage , transcriptional regulation seemed to be a relevant mechanism .
folded_tokens: however , in differentiating erythroid cells , which must incorporate high levels of iron to sustain hemoglobin synthesis , and in macrophages , which are involved in iron storage , transcriptional regulation seemed to be a relevant mechanism .
labels: O O O B-cell_type I-cell_type I-cell_type O O O O O O O B-atom O O B-protein_complex O O O O B-cell_type O O O O O B-atom O O B-other_name I-other_name O O O O O O O