An event of CRE-recombination gives rise to expression of one of four possible fluorescent proteins at the same time as the induction of overexpression of MYC. All possible fluorophores were seen throughout hindbrain cells expressing the Glt1 promoter; however, in the brains analyzed, there was a preponderance for tumor cells expressing red fluorescent protein (RFP) and yellow fluorescent protein (YFP). Here, MYC is linked to neoplasm.