Hi, I am quite new to the limma package and I would like to know how there is a possibility to get the link between the gpr file entries and the used identifiers. In the header it says there is no gal file and in the xls file there seems to be a completely different order. Is there a simple way to get the link between the identifiers and the data from the gpr (genepix) file? Gunter [[alternative HTML version deleted]]