Copyright information:Taken from "Molecular archeology of L1 insertions in the human genome"Genome Biology 2002;3(10):research0052.1-research0052.18.Published online 19 Sep 2002PMCID:PMC134481.Copyright © 2002 Szak et al., licensee BioMed Central Ltd L1 segments shown with solid lines were found when we used the L1.3 sequence as our library for RepeatMasker; the percentages indicate the percent identity of each segment to L1.3. L1 segments indicated with dashed lines were found when we further analyzed the sequence using the full set of RepeatMasker libraries; these segments were identified as L1MA9 family members. The 3' UTR of the L1MA9 subfamily of L1s is 160 nucleotides longer than that for the Ta family of L1s []; thus, we were unable to determine the percent identity of the L1MA9 segments to L1.3.