The rat glial C6 cells (1 × 105 C6 cells/ml) were cultured in a 6-well plate for 24 h. After removing the culture medium, the cells were washed with PBS. C6 cells were cultured in DMEM without FBS (500 μl) and incubated with Acanthamoeba EVs (100 μg) in PBS. The total volume of culture medium was adjusted to 1 ml. DMEM without FBS (500 μl) combined with PBS (500 μl) served as a negative control. After 24 h of co-incubation, the cells were washed, paraformaldehyde-fixed, and then stained with Giemsa stain (Merck, Darmstadt, Germany) [36].
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