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C. Thermal Cycling

Marlow developed and sells the most robust thermal cycling modules available. These modules, the XLT series, can be put through more than a million rapid cycles with less than a 10% change in ACR. The demand for XLT modules is dominated by an application in which the modules are used to drive a thermal cycle that results in replication of DNA (e.g., for drug discovery and crime analysis), the polymerase chain reaction technique. The PCR cycle is between 55° and 95°C, while we drive our modules between 15° and 95°C at a demanding 5°C/sec. The performance of our XLT modules in this qualification test far exceeds the actual requirements of our customers.