ICAM2 and neuroblastoma: ICAM-2 protein had the expected apparent mass of 55–60 kDa [31] in all six neuroblastoma cell lines (as well as other types of solid tumor cell lines [data not shown]), and the level of ICAM-2 expression varied with SJNB-1A>NB-1691, SK-N-SH and NB-1643>SK-N-AS and IMR-32.