MLPA electrophoresis peak-area patterns. R: Reference non tumoral DNA. PC: Positive control of an oligodendroglioma with known 1p/19q codeletion (arrows). P: pediatric glioma with homozygous deletion of a number of markers (arrow-heads) and hemizygous deletion of BAX (arrow). Genes and genomic regions at 1p are coloured in red, at 19q are green, and the other probes are black.