Quick unrelated question: Could any typing done by 23andme.com be used by the marrow registry? I would think itd be awesome if a voluntary, opt-in data sharing agreement was established between the two organizations. When you login after your genotyping is done, one of the options could be "Do you wish to share your typing information to become a marrow donor?"
I don't mean to insinuate that it's a light decision to make (I recently joined the marrow registry, even though I won't be a match to Amit due to my ethnicity), but if the data already exists, why not reduce the friction to being a donor?