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Chromosomal abnormalities such as aneuploidies and DNA damage are considered a major threat to the establishment of healthy eggs and embryos. Recent landmark studies showed that mouse oocytes with damaged DNA can resume meiosis and undergo Germinal Vesicle Breakdown (GVBD), but then arrest in metaphase of meiosis-I in a process involving Spindle Assembly Checkpoint (SAC) signalling. Such a mechanism could help prevent the generation of metaphase-II (Met-II) eggs with damaged DNA. However wedoi:10.1101/752113 fatcat:rwxbhqoyejgt5arjmzjc2gok4m