Global expression map showing transcriptional activity of TE-related and randomly selected non-TE-related genes. Only 1,353 TE-related genes with transcription in at least one sample are included. Another 1,353 non-TE-related genes randomly picked from those with transcription in at least one samples are shown in parallel. Each lane represents one sample in the same order as in Table 2. Shades of gray indicate the magnitude of transcription signals, which are based on microarray hybridization signals without units. TE, transposable element.