K562 cell is a pluripotential human erythroleukemia cell line that can be induced by a number of chemical agents such as hemin and hydroxyurea to undergo erythroid differentiation. The cell line remains an attractive model for the study of cancer chemotherapy and cell differentiation.Gene chips or DNA microarrays technology, which arises in recent years and intercrosses molecular biology, micro-electronics and other disciplines, is a powerful tool for analyzing hundreds and thousands of genes simultaneously...