In-vitro-fertilized human embryos often acquire large structural and numerical chromosomal abnormalities. Liu et al. now show that multiple smaller copy number variations may also arise in in-vivo-conceived embryos. Analysis of these… Click to show full abstract
In-vitro-fertilized human embryos often acquire large structural and numerical chromosomal abnormalities. Liu et al. now show that multiple smaller copy number variations may also arise in in-vivo-conceived embryos. Analysis of these variations provides insight into the DNA mutational processes occurring in early embryos and the mechanisms underlying them.
               
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