In TrkA SH-SY5Y cells (Figure 4A) at 15 minutes post-labelling, 79.2±10.8% of immature 110kDa TrkA was ER-associated (fractions 5 and 6), 26.9±2.3% COP-associated (fractions 3 and 4), 5.9±0.6% GN-associated (fractions 1 and 2) and low-level 140kDa TrkA was detected exclusively in GN fractions 1 and 2. This evidence concerns the gene NTRK1 and ganglioneuroma.