Abstract
Medicine Liquid biopsies, analyses of cell-free DNA that circulates in the blood, can be used in prenatal testing, oncology, and to monitor organ transplant recipients. Lo et al. review the nongenetic information that can be gleaned from analyses of cell-free DNA, which offers additional promise for the applications of this procedure. These analyses include DNA methylation patterns, fragmentation profiles, and topology, which can be informative about the health and origin of the tissue from which they are derived. Science , this issue p. [eaaw3616][1] [1]: /lookup/doi/10.1126/science.aaw3616
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