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qPCR and qRT-PCR
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Basic principle of real-time quantitative PCR

Real-time qPCR is a PCR method used to amplify and simultaneously quantify target DNA molecules. Two methods are frequently used for qPCR: double-stranded DNA-binding dyes (like SYBR Green) or fluorescent reporter probes (like TaqMan). In both cases, fluorescence signals are detected during the exponential phase.