MAPK3 and neuroblastoma: Because of the known involvement of ERK1/2 in cell survival and differentiation (O'Neill and Kolch, 2004) and since it was one of the most strongly phosphorylated proteins in the array as well as consistently phosphorylated in different MNA and NMNA neuroblastoma cell lines treated with fatty acid synthesis inhibitors, we analyzed their phosphorylation and thus activation in more detail.