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The image describes a Chinese fairy tale, the “King Yu tamed the flood”, wherein King Yu recruited and directed people to mend the broken river wall. Pre-ribosomal RNA interacts with MDC1 and may direct repair factors, such as TopBP1 and BRCA1, to DNA double-strand breaks in the XY body of male germ cells as well as in somatic cells. See page 254-268 by Xiaochen Gai et al. for details.