Thus , human erythroid precursors can be expanded in vitro in sufficient numbers and purity to allow its usage in signal transduction studies .
thus , human erythroid precursors can be expanded in vitro in sufficient numbers and purity to allow its usage in signal transduction studies .
O O B-cell_type I-cell_type I-cell_type O O O O O O O O O O O O O O O B-other_name I-other_name I-other_name O