Sensitive cell lines show defects in purine and pyrimidine biosynthesis.

A-B) Cells were treated with 0.4 μM GNE-617 and levels of UMP and IMP (A), GMP and UDP (B) were determined as described in Fig 2A (Ave ± SD, n = 5). * indicates a p-value of <0.05, and statistical analysis was performed using a Mann Whitney t-test (two-tailed); “ns” indicates not-statistically significant. C) Level of mono-nucleotides (n = 8), diphosphorylated-nucleotides (n = 7) and triphosphorylated-nucleotides (n = 7) in cells were determined following treatment with 0.4 μM GNE-617 (shown is the average and SD for each group). * indicates a p-value of <0.05, and statistical analysis was performed using a Mann Whitney t-test (two-tailed); “ns” indicates not-statistically significant.