February 19, 2021

On the Cover
DNA fragments (yellow) derived from a transplanted heart alongside the patient’s own DNA (blue). A new blood test measures donor DNA fragments and detects acute heart transplant rejection earlier than current methods. A study on the new test was published in the journal Circulation and was funded by the NHLBI Division of Intramural Research. February is American Heart Month.
Photo: Erina He, NIH Medical Arts