Ratio of HERVE 6q15 to RNGTT expression in renal cell carcinoma cell lines in CCLE ( left ), and RNGTT expression (assessed by RTPCR and plotted relatively to HPRT1 expression) in A498 cells with (clone 1E7, HERVE 6q15 +/+ ) or without (clone 2D11, HERVE 6q15 / ) the HERVE 6q15 provirus ( right ). Symbols represent replicates of 4 independent experiments, connected with lines ( p value calculated with twotailed paired Students ttest).