Is there any specific sample size formula for evaluation of gene expression level by Quantitative PCR (Real Time PCR)?

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Jochen Wilhelm

No. Nothing specific. The sample sizes are calculated as usual, depending on the kind of data you have, the questions you ask, the effects you consider relevant, and the error rates you wish to control.

Sajad Jamalpour

Thanks a lot, but what about the formula that I attached!!? Can I use this one for normal qPCR and do the sample size by that?

I don't see whe it should not.