I registered as a bone marrow donor at Notre Dame while visiting the campus with my daughter in April.  Perhaps your son's Bar Mitzvah post had a subliminal influence on me, or maybe it was a HC coincidence.     I have mixed feelings about this.  The recipient of my marrow whenever it happens, will receive a new chance at a normal life, but then again my marrow is probably loaded with some funky legacies................ 
 
 
Congrats to your son!