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Will I see competition between probes when using a multiplex assay?

The Multiplex I cfDNA Reference Standard Set contains two mutations at very close proximity: NRAS Q61K and NRAS A59T. Competition between the probes can be observed when analysing Multiplex I for the NRAS A59T mutation, Eg. an extra population can be observed in 2D plot ddPCR analysis mode probably representing non-specific amplification of the NRAS Q61K mutation.