Intronic underrepresentation zones by TE class.

The distributions of TEs were normalized by the overall G/C content preference of each TE class.
aUnderrepresentation zone based on distribution of all elements of each TE class.
bUnderrepresentation zone based on distribution of only ‘near full-length’ (FL) elements.
cThe cutoff size of full-length elements for each TE class was determined as slightly shorter than the average full-length elements as described in [1] and [2].