In all 50% of the mice inoculated with clones expressing both KRAB/FLI-1 and EWS/FLI-1 did develop small palpable tumours (7±2 mm3) in the latter part of the experiment (Figure 6A and 6B); however, these tumours continued to grow very slowly (data not shown). Here, EWSR1 is linked to neoplasm.