NT, pcDNA and TrkA SH-SY5Y cells formed similar numbers of similar-sized tumour spheroids over 14 days in soft agar tumourigenesis assays, under basal conditions (Figures 2a and b, identical results were obtained for duplicate cell lines and results are displayed for single NT, pcDNA and TrkA SH-SY5Y cell lines). The gene discussed is NTRK1; the disease is neoplasm.