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Polymerase chain reaction (PCR) product analysis. The polyacrilamide gel illustrates the pattern obtained on different samples of nasopharyngeal angiofibroma (NA). Lane 1: positive control; Lane 2: molecular weight; Lanes 3, 5 and 6 illustrate “positive” amplification products for EBV; Lane 4: a “negative” case of angiofibroma for EBV
