Changes in expression of transposable elements in tumor cells. Fold change (log₂) of several classes of transposable elements and repeated sequences in lymphoma cells including traces of clades L1 and CR1 of long interspersed elements (LINEs), long-terminal repeat retrotransposons ERV1, ERV2 and ERV3, and short interspersed elements (SINEs). *P < .001. †P < .0001.