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.