Figure 2From: Structural characterization of helitrons and their stepwise capturing of gene fragments in the maize genomeA phylogenetic tree of DNA helicase of putative autonomous helitrons of maize and other species. The phylogenetic tree was constructed by the neighbor-joining method using MEGA4 software [32] with 1,000 bootstrap replicates, the bootstrap scores < 50% were deleted. The accession numbers and names of the putative helicases of other species were abbreviated as shown in Figure 1, with the addition of the following: Bo, Brassica oleracea (ABD65117); Mt, Medicago trunculata (ABE82731) [10].Back to article page