A structural aberrancy in DNA, as opposed to a sequence change (mutation). Often caused by reactive species.

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Is a single x-ray photon capable of doing enough damage to the dna of a cell to kill that cell?

Ionizing radiation is damaging to DNA, but is there such a thing as a safe dose below which no DNA damage could occur? I'm not asking about a minimum safe dose overall, just whether or not there's an ...
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Which is the best way to fix and preserve comet assay slides before staining with Ethidium Bromide?

I want to use the method of Single Cell Gel Electrophoresis (comet assay). I have many samples, but I don't have the appropriate microscope. So I have to preserve my slides until the time comes for ...