2 × 105 cells were suspended in serum-free medium and then placed in the superior compartment of 8 μm-well Transwells (BD Biosciences, San José, CA, United States). The lower compartment with 10% FBS was regarded as a chemical attractant. After cells incubating at 37°C for 2 days and staining for 15 min, 5 fields of view (× 200) were stochastically chosen under the microscope to calculate translocated cells.
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