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Impact of PD-L1 knockout on tumor growth in chick embryo CAM. (A) Tumor weight of the control and PD-L1 knockout cells. The cells were inoculated and allowed to grow on chick embryo CAM for 8 days. (B) Pictures of the tumors after extraction on Day 17. (C) Percentage of alive embryos in each group. Columns are means; bars are S.E.M. **** p < 0.0001.
