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T4 DNA ligase is a widely used ligase in many applications; yet in single nucleotide polymorphism analysis, it has been found generally lacking owing to its tendency to ligate mismatches quite efficiently. To address this lack of selectivity, we explored the effect of temperature on the selectivity of the ligase in discriminating single base pair mismatches at the 3'-terminus of the ligating strand using short ligation probes (9-mers). Remarkably, we observe outstanding selectivities when the assay temperature is increased to 7 °C to 13 °C
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