Cluster analysis of DNA microarray data from samples before, during and after cardiac rejection. Cluster analysis of DNA microarray data from endomyocardial biopsie samples from three subjects before, during and after cardiac rejection. Nine clusters were generated by SOM clustering containing 0–22 genes. The mean profile of the cluster members are indicated by solid lines and the dashed lines indicate standard deviation. The number of cluster members is indicated within parenthesis. Circles indicate the analysed time-points in the histopathological sequence (before, during and after rejection).