Normal volunteers and volunteers with lymphoid/hematologic malignancies will not be tested for HIV or hepatitis to determine eligibility for this protocol. However, DTM guidelines will require that patients undergoing apheresis with subsequent ex vivo elutriation of the collected products will be required to have testing for HIV and hepatitis B and C. Volunteers who are required to be tested for HIV and Hepatitis will be informed at the time of enrollment and will sign an appropriate informed consent for these tests. Volunteers who are found to be HIV positive or hepatitis B or C can still donate blood products, but these products will not be subjected to ex vivo elutriation.