Effect of LY6K knockdown on glycolysis of A549 cells. A, Glucose content in cell culture medium after LY6K knockdown by A549 cells, * p <0.05; B, Lactate content in cell culture medium after LY6K knockdown by A549 cells, * p <0.05; C, ATP concentration in cell culture medium after LY6K knockdown by A549 cells, * p <0.05.