To determine that P-Rex1 was a generalizable target in neuroblastoma, immunoblotting was performed using 11 human neuroblastoma cell lines, including the MYCN-amplified BE(2)-M17, CHP-212, IMR-32, JF, LAN-1, SK-N-BE(2), and SK-N-DZ, and the MYCN non-amplified SHEP, SK-N-AS, SK-N-SH, and SH-SY5Y cell lines. The gene discussed is MYCN; the disease is neuroblastoma.