Transposable elements were identified using Repeat-Masker [6 ] and MIPS Repeat Element Database (mips-REdat) and Catalog (mips-REcat) [27 ,28 (link)]. This database provides a hierarchical classification of plant transposable elements and other repeat types. Before use, the database was screened for non-TE related sequences and the following identifiers were removed: 'bsr1' (containing cytochrome P450 and hydrolase sequences), 'k_1' (containing proton-ATPase sequence), and 'magellan_cone' (containing myb transcription factor sequence).
Receiver operating characteristic (ROC) curves were compared by the method of [29 (link)], as implemented in the MedCalc® statistical software package.
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