CPEB4 and neuroblastoma: To investigate the cellular function of CPEB4 exon 1 LCD, we expressed a GFP tagged version of this 375 amino acid polypeptide as well as the C-term region (residues 376-712) and the full-length (FL) CPEB4 protein in N2a mouse neuroblastoma cells (Fig. 4D–G) or 293T cells (Fig. 4H–I).