I'm dealing with RNA seq data and obtained FPKM value using cufflinks for treated and control samples. Do i want to normalize these value to obtain p-value or it is sufficient to find DE genes?. If i want to calculate p value using this FPKM. what would be the best test to go with this? How to get the P value?. So far I have used fold change values and created Venn diagrams to show transcripts between each condition. I need to find DE genes. I am new to this field and So anyone please give some solution for me to move step forward.