Given that the full-length TrkC is increased while truncated TrkC is decreased in human neuroblastomas upon exposure to retinoic acid that limits proliferation and induces differentiation [12], we compared mRNA expression of full-length TrkC and truncated TrkC in control and in uPAR-deficient clones (Figure 8). The gene discussed is NTRK3; the disease is neuroblastoma.