Hello, I have the following question which I could not find the answer from the FAQ. What does the R.fold mean in the siggenes sam? Why does it give such a big number such as 2.68E+74, or small number such as 1.18E-25? It is different from the fold I got from the Excel SAM that seems the real fold change. Thanks in advance, Wayne -- Row d.value stdev rawp q.value R.fold Name 8374 11.34 15.941 0 0 2.68E+74 208817_at 43254 -10.78 4.641 0 0 1.18E-25 243391_x_at 39282 -9.02 3.225 0 0 2.13E-09 239419_at 5654 8.93 5.959 0 0 4.85E+27 206066_s_at 19348 8.81 12.15 0 0 4.31E+34 219922_s_at 17647 8.66 8.413 0 0 1.03E+22 218220_at