Whether this is novel (as in new) or novel (as in a dramatic story), is a subject of a debate that only a handful of scientists can reasonably speculate on based on forensic genomics
Most likely, the exosomes dock and release their contents rather indiscriminately into any and all cells.
When a person realizes that we are all time travelers without “do-overs” moving at a speed of one day per day through our lives, we can accept responsibility for untoward events, whether they be of equal, lesser, or higher probability because of our actions.
Cells in their prime act better and influence the ecology of the host differently. When scientists make a chimera by sewing a young animal to an older one, the younger animal’s cells have a ‘youthening’ benefit to the older half of the surgically-Siamese twin.