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BACKGROUND In standard analytical conditions, an isolation step is essential for circulating tumor DNA (ctDNA) analysis. The necessity of this step becomes unclear with the development of highly sensitive detection methods. The aim of this study was to evaluate ctDNA mimetic nDNA detection as reference materials (RMs) using dPCR technologies either directly from serum or without serum. METHODS To determine an absolute count of both mutation and wild-type bearing DNA molecules, genomic DNA (gDNA) and nucleosomal DNA (nDNA), which are si