Densitometric analysis revealed that EWS-FLI-1, EWS-ERG and the ESFT-associated FUS-ERG isoform were expressed at comparable levels, whereas the DBDM, FLI-1, ERG-1 and the AML-associated FUS-ERG isoform displayed a 1.5 to 2.5 fold higher expression level (Figure S1). Here, EWSR1 is linked to acute myeloid leukemia.