passages.id: split_1_test_1004_passage
passages.type: progene_text
passages.text: ETR-1 is related to the family of RBPs defined by the protein ELAV , which is essential for neurogenesis in the fruit fly Drosophila ; members of the family possess two consecutive RNA recognition motifs ( RRMs ) separated from a third , carboxy - terminal RRM by a tether region of variable length [3] [4] [5] [6] .