Hi everyone,

I am checking IR sensitivity using U2OS wt and KO cells.

I treated IR one day after I seeded cells.

For control, I prepared cells (seeded in the same day) without IR treatment.

3hr later, I harvested the cells.

I have seen the stronger pS139 H2AX signals in my control samples than 2Gy or 5 Gy samples.

I have tried to use different brand antibodies, cell lysis buffer, and new cell stocks. But I still see the band.

is it possible to see the strong signals in 0 Gy samples? or is it because the mistakes that I have not found yet?

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