passages.id: split_4_test_553_passage
passages.type: progene_text
passages.text: Moreover , extended homologies are found between promoters of Tto1 and an asparagus defence gene , AoPR1 , suggesting a possibility that the ancient insertion of an ancestral Tto1 - related retrotransposon has provided some of the promoter / regulatory sequences , including the 13 - bp motif - related sequence , of the AoPR1 gene .