This is good news, to be celebrated with caution. The first patient with a CRISPR-edited pig kidney has left the hospital. A little over two weeks have passed since the surgery at Massachusetts General Hospital, but according to U.S. press reports, Richard Slayman is well enough to have been discharged. Fingers crossed, then, for this 62-year-old man who, thanks to a xeno-rene, no longer needs dialysis.