Fig. 4From: Genetic alteration and mutation profiling of circulating cell-free tumor DNA (cfDNA) for diagnosis and targeted therapy of gastrointestinal stromal tumorsQClamp™ xenonucleic acid (XNA) probe hybridizes to wild-type DNA (WT-DNA) templates and prevents WT-DNA from being amplified, while melting off from the mutant DNA template so that only mutant DNA is amplifiedBack to article page