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*2.9.* To understand why this error is occurring, let's examine the contents  of the new annotation file we just tried to load. A partial screenshot  of the file appears below as viewed in a Microsoft Excel 2007

 window.

 !step9d.png|border=1,alt="The newly loaded annotation file, shown in an Excel window, contains duplicates of subjects from previously loaded files."!

Notice that this file contains not only new subjects (IDs 6000 to  6002), but also some of the same subjects (i.e., IDs 3, 5, and 10) from  the previously loaded file  "subject_annotation_DC_Lung_Study_111210.csv". In addition, the values  in the 'Stratagene' field for these subjects are different in the new  file than they were in the original file. This explains the 'Value  Already Loaded' error message which occurs when we attempt to load the

  file -- this message is another way of saying that the file we're trying  to load contains duplicates of subjects from previously loaded files.

We've learned a valuable lesson from this exercise: when loading  additional annotation data into an existing study, make sure that your  annotation file doesn't contain any duplicates of existing subjects from  previously loaded files.

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