Hi Cary, There should be no problem to import this dataset. In ArrayExpress you'll find most of the time two files that are related to a certain experiment. One contains the experiment data and begins with an 'E' . In your case this is E-CAGE-*. This is also the file you find when searching for an experiment via ArrayExpress. The second xml file contains all information on the ArrayDesign and begins with an 'A' you'll find this file by clicking on the link 'Array design used' which you'll see when you searched for an experiment. For you this is A-MEXP-10. So now you'll have two MAGEML files from which the combined information results in a marrayRaw object. First get the array design info and make a layout and gnames object with the command widget.readMageDesign. Here you'll have to point to both files, see manual. You can use the show packages button to see if the package that is required is present in the file you pointed to with browse. Secondly make the raw object by using widget.readMageRaw. Here you'll only have to use the xml file from E-CAGE ... Let us know if you still run into problems. Cheers, Steffen & Joke ------------------------------------------------------------------- Hi all, I am attempting to use public MAGEML data without success. My current datasets are E-CAGE-{2,3,4} from ArrayExpress. According to the tutorial a MAGEML file requires packages BioAssayData BioAssay BioMaterial BioSequence ArrayDesign DesignElement I suppose this is the problem because inspection of package content shows this: > magePackageDetector(ecage3) File aVIB-Col_vs_aUNIL-Col.xml contains the following packages: BioMaterial_package BioAssay_package QuantitationType_package BioAssayData_package There is only 1 xml file included with the data. How can I get the correct packages? Any help will be appreciated. Thanks --cam -- //=\ Cary Miller //=\ \=// Center for Computational Pharmacology \=// //=\ University of Colorado Health Sciences Center //=\ \=// http://compbio.uchsc.edu/Hunter_lab/Miller \=// //=\ (303) 315-1584 //=\