Fig. 1

Expression and sample landscapes of lymphoma subtypes. a Mean expression portraits of the major B cell lymphoma subtypes and of the controls are characterized by red-blue spot patterns which reflect clusters of co-expressed genes up- and downregulated in the subtype on the average, respectively. The complete gallery of individual sample portraits is available in Additional file 3. b The correlation network visualizes the similarity relations between the samples as an undirected graph. The nodes represent the samples and are colored according to their class membership. The edges connect sample pairs whose expression landscapes are mutually correlated with Pearson’s correlation coefficients larger than 0.5. The small networks in the part below highlight each individual class considered. Part of the lymphoma types and of the controls occupy localized areas (e.g. BL and tonsils), while other types distribute over wider regions (e.g. intermediate lymphomas and FL/DLBCL) thus reflecting a more heterogeneous composition of the respective groups