Specifically, the mammary gland tissues and spontaneous tumors were harvested from mice 6 h after HS201 (100 nmol/mouse) injection, enzymatically digested into single breast tumor cells or mammary epithelial cells, stained with CD24 and CD45, and analyzed by an LSRII flow cytometer (Fig. 4d). The gene discussed is CD24; the disease is breast neoplasm.