Summary of expression of TE-related genes. (a) Percentage of the transcribed type I and type II TE-related genes and non-TE-related genes in different samples. Percentages of transcribed genes in each category are shown for all samples. (b) Levels of transcription can be inferred based on how often (in how many different samples) expression was detected for TE-related and non-TE-related genes. TE, transposable element.