Centromeric K111 s were amplified by PCR with the primers P1, which binds to K111 flanking centromeric repeat CER:D22Z3, and primer P4, which binds to the K111 gag gene to produce a ~ 1.6 Kb amplification product [25 (link)]. The PCR was carried out using the Expand Long Range dNTPack PCR kit (Roche Applied Science, Indianapolis, IN). PCR was performed at a final volume of 50 μl using an initial step of 92 °C for 2 min, followed by 35 PCR cycles consisting of denaturation at 92 °C for 15 s, annealing at 55 °C for 30 s, and extension at 68 °C for 5 min. Amplification products were confirmed by sequencing [25 (link)].
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