STELA was conducted as described previously, using genomic DNA (250 pg/reaction) for telomeres at 12q (12qSTELA primer), 17p (17p6 primer) and XpYp (XpYpE2 primer), and 500 pg/reaction for the ciHHV-6-associated telomere (DR1R primer)25 (link),34 (link)56 (link). Individual amplicons, detected by phosphor-image analysis, were sized using the Imagequant software (Typhoon 9400, GE Healthcare) with known size markers (GeneRuler 1 kb and GeneRuler High Range DNA ladder, Fermentas), and the length of the flanking sequence was subtracted. The telomere lengths were presented as scatter plots with median and interquartile ranges. Telomere lengths in the blood and PEL samples were compared using the non-parametric Kruskal-Wallis test (GraphPad Prism; GraphPad Software Inc., CA, USA).
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