Total RNA extraction was carried out with trizol reagent (Invitrogen), and quantitative reverse transcription-PCR (Q-RT–PCR) was performed as described.34 (link)Total protein extracts were obtained and separated as described.34 (link) The following MoAbs were used: mouse anti-MYCN and mouse anti-β-tubulin (Santa Cruz Biotechnology, Santa Cruz, CA, USA); and rat anti-Gal-3 purified monoclonal antibody (Space Import & Export). Immunoreactive bands were visualized by enhanced chemoluminescence (Perkin Elmer, Waltham, MA, USA).