Donors with a history of malaria, donors who have a family history of CJD, donors who have undergone tattooing or body piercing within the prior 12 months, donors who have received a graft such as bone, skin or dura mater, donors who are taking finasteride or retinoids, and donors who have had sexual contact within the past 12 months with a person who has symptomatic hepatitis C infection or donors who have lived with a person who has hepatitis in the last 12 months, are similarly eligible for research-use only donation on this protocol.