Maximum likelihood trees for reverse transcriptase genes classified as Copia-type and Gypsy-type LTR and LINE elements. (a) Copia-type; (b) Gypsy-type LTRs; (c) Gypsy-type LINEs. The maximum likelihood trees show rate heterogeneity and no recent expansive radiations (that is, short terminal branches). Reverse transcriptase sequences were mined from BAC end sequence set.
Zuccolo et al. Genome Biology 2011 12:R48 doi:10.1186/gb-2011-12-5-r48