Figure 4.

Visualization of different piRNA clusters. Every illustration of a piRNA cluster is associated with some sequence annotation which refers to the presence of repetitive sequences and genes. 4a: Cluster detected with proTRAC, not annotated at piRNABank. 4b: Cluster annotated at piRNABank, rejected by proTRAC because of its atypical topology. 4c: Upper illustration shows a cluster (not annotated by Lau et al. 2006 [5] but detected with proTRAC) arisen from a segmental duplication of the lower cluster. 4d: Two visualizations of the same cluster detected with different methods. Upper cluster (proTRAC) includes sequence reads that map more than 5 times to the genome, lower cluster (Girard et al. [4] method) does not include sequence reads that map more than 5 times to the genome. Black bars: single-copy loci, red bars: multi-copy loci.

Rosenkranz and Zischler BMC Bioinformatics 2012 13:5   doi:10.1186/1471-2105-13-5
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