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Well, one of the professors at my former university (specialized in genetics) told us that we know very little about epigenetic changes. I think, but I'm not sure, that she said that some epigenetics marks remain from parents to offspring. But mostly the problem of the study is that it has a sample of only 32 individuals, so it can't be extrapolated to the population that it studies (Holocaust survivors that have children). I find that the experiences with mice that are exposed on the last paragraphs are quite important though.