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A patient, having a huge hepatic hemangioma, presented with decreases in the number of peripheral lymphocytes and in serum concentrations of γ-globulin and immunoglobulin (Ig) G, and a negative purified protein derivatives skin test, indicating that the patient's immunity was impaired. The plasma concentration of transforming growth factor β1 (TGF-β1), a potent immunosuppressor, in the patient was...
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