Participants will receive a total of up to seven infusions of MRA given every 2 weeks in the clinic. The MRA is infused over a period of about 1 hour through a catheter (thin plastic tube) inserted into an arm vein. Patients will be observed for 1 to 2 hours after each infusion for drug side effects. For the first and last infusions, patients will return to the clinic for blood tests 24 to 48 hours after the infusion. Additional tests may be done if medically indicated.