Spectrum of genomic alterations in oligodendroglioma. A: ~800 single base alterations were found in each tumor, like the G > A transition in the STMN2 gene shown. B: A ~8 kb insertion from tumor HF1551. 179 such indels were detected per sample. C: A 352 kb inversion that disrupts pseudogene INTS4L1 and encompasses the zinc-finger transcription factor ZNF92. D: Loss of one copy of chromosome 1p, a hallmark of oligodendroglioma.