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Representative results of polymerase chain reaction (PCR) analysis of heavy chain gene rearrangement. Silver stained 12% polyacrylamide gel of PCR products from DNA samples obtained from patients with indolent systemic mastocytosis (lane 1), immunocytoma (lane 2), positive control (lane 3), and negative control (lane 4). M, low molecular weight marker. Whereas in indolent systemic mastocytosis the products show a polyclonal pattern, immunocytoma exhibits a monoclonal pattern.
