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1. There is no mention of any assessment of RNA quality, either of its integrity or purity (ie the absence of inhibition). 2. Furthermore, agains all well-published evidence, the authors use a single, unvalidated reference gene to normalise, showing quite marginal differences in mRNA levels in Figure 3. There is a huge body of literature that shows very clearly that this kind of analysis is misleading and inappropriate.
4. it has also been well-known since 1998, when ABI published the details of the DDCq method, that the PCR efficiencies of both genes of interest and reference genes must be known, as otherwise this method of analysis is invalid.

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