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![Expanded knowledge of cell-free DNA biology: potential to broaden the clinical utility](https://image.oaes.cc/61a32f50-ec32-47ce-90b9-4e886e2185e6/5089.fig.3.jpg)
Figure 3. Illustration of ctDNA derived from other body fluids other than blood. Different forms of markers present in biological fluids, including circulating tumor cells, circulating cell-free DNA and circulating tumor DNA, histone-bounded DNA, exosomes, extrachromosomal circular DNA and mitochondrial DNA.