The upregulation of ase mRNA (in bratchs/Df(2L)ED1272 heads) and protein (in homozygous bratchs brain tumors) could reflect the presence of Ase+ immature INPs, mature INPs and/or GMCs from the Type II lineage, consistent with the idea that the Type II lineage is affected by bratchs in adult brains. This evidence concerns the gene ARSL and brain neoplasm.