ADP (10−10 M – 10−4 M) added to CHO-P2Y12 (1×105 cells/well), RvE1 (10−10 M – 10−6 M), LTE4 (10−12 M – 10−8 M) or LTD4 (10−12 M – 10−8 M) were added (60 minutes at 37°C). All incubations were stopped with lysis buffer containing emerald substrate reagent for (60 minutes, 21°C). EC50 values were determined by curve fit analysis using GraphPad software (see methods). (A) ADP (squares) and RvE1 (triangles) dose response. Values are mean ± SEM of n=5. (B) RvE1 (10−10 M – 10−7 M), when added simultaneously with ADP. (C) LTE4 (circles) and LTD4 (triangles) dose response. Values are mean ± SEM of n=6. (D) LTE4 (10−9 M – 10−8 M) followed by ADP (10−5 M). Values are mean ± SEM , n=3, *p<0.05.