Figure 3(A): Bystander cell killing was assessed by relative evaluation of annexin V staining in AZT-treated bystander eGFP-expressing PC-3 cells, co-cultured with TMPK-F105Y-tranduced PC-3 cells, by flow cytometry. Co-cultures were either left untreated or treated with the pan GJIC inhibitor, carbenoxolone (CBX).