Drosophila muller f elements maintain a distinct set of genomic properties over 40 million years of evolution. - Leung W; Shaffer CD; Reed LK; Smith ST; Barshop W; Dirkes W; Dothager M; Lee P; Wong J; Xiong D; Yuan H; Bedard JE; et al. (G3 (Bethesda, Md.), 2015)