Inter-retrotransposon amplified polymorphism-polymerase chain reaction amplification using human endogenous retrovirus type K member 11-specific primers. Lane numbers correspond to the subjects listed in Table I. M, marker (GeneRulerTM100 bp plus; Fermentas; Thermo Fisher Scientific, Inc., Waltham, MA, USA); NC, negative control (no template DNA). Arrows indicate polymorphic bands.