Donor cen­ters run recruit­ment cam­pai­gns to encou­ra­ge peop­le to regis­ter as stem cell donors. Anyo­ne inte­res­ted can con­ta­ct a donor cen­ter them­sel­ves or may regis­ter for one of the typ­ing cam­pai­gns which are adver­ti­sed in the media. Many blood dona­ti­on ser­vices also offer the oppor­tu­ni­ty to be typed when making a blood donation.