# Source notes

This submission uses only the scientific facts locked in the bounty brief:

- Cell-free DNA consists of fragments released into blood from dying cells.
- In healthy samples, fragment lengths show a characteristic rhythm around 167 base pairs, associated with DNA wrapped around a nucleosome plus linker DNA.
- Cancer can disrupt chromatin packing and produce a more disordered fragment-size distribution.
- DELFI evaluates genome-wide fragment-size patterns in large bins; the concept shown here is fragmentation pattern, not DNA sequence.
- The brief attributes the reported work to the Johns Hopkins Kimmel Cancer Center on July 31, 2026, and says it was validated in Romanian and Guatemalan high-risk populations with different etiologies.

The artwork deliberately makes no claim about accuracy, sensitivity, specificity, clinical availability, or individual diagnosis. No external facts, URLs, publications, or journal marks are included.