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Long range PCR of the exon 3 region of SDHB. Lanes 1 & 3. Patients carrying deletions showed an anomalous fragment of ~9 kb. Lanes 2 & 4. Two healthy controls lack the anomalous ~9 kb fragment. The normal fragment (~16 kb) is weakly visible in all lanes. A PCR control fragment of ~4.7 kb is also visible in all lanes.
