Dear group, In analyzing CEL files using justRMA, does RMA algorithm considers MASKS and outlier data reported at the bottom of the CEL file. Are these numbers really important in analyzing array data. Is it okay strip this data for any analysis? Any suggestions please. [MASKS] NumberCells=0 CellHeader=X Y [OUTLIERS] NumberCells=215 CellHeader=X Y 49 0 579 8 211 12 338 13 Thank you. PS _______________________________ Express yourself with Y! Messenger! Free. Download now.