hello, I'm sorry if the question may seem trivial but I am a beginner in this field. I have a dual microarray and I have calculated the Z-scores for each gene, I have to find the ones differentially expressed . Is it correct if I get the corresponding p-values and use a volcano plot to decide the cut-off value? are there any other steps I should do? (I've already done the correction and normalization steps). If the microarray slides were two, would this method still be correct?