Supervised clustering using Cluster/Treeview software was carried out with normalized signal intensities for baseline IgG (left) and IgM (right) autoantibodies in ILE patients. Red represents values greater than the row mean and green represents values below that mean; gray corresponds to missing data. All Prog patients (progressors) are grouped together on the right side of each array and are indicated by rectangles.
Olsen et al. Arthritis Research & Therapy 2012 14:R174 doi:10.1186/ar3927