This work was supported by the National Natural Science Foundation of China (Grant No. 20071022) and the Natural Science Foundation of Shanxi Province (Grant No. 991013).
Using isotopic labeling of human serumapotransferrin, the binding and the endocytosis of monoter-bium transferrin (TbC-apotransferrin, TbC-apotransferrin-FeN) by K562 cells, a human leukemic cell line, have beeninvest...