Platelet counts after infusion of plasma containing anti-rhML antibodies in three dogs, two normal dogs (dogs C and D) and one dog made thrombocytopenic 10 months previously with repeated administration of rhML (dog A). (□) Represents dog A, infused with dog A's plasma; (○) represents dog C, infused with dog B's plasma; (⋄) represents dog D, infused with dog M's plasma.