PERLs are transposon-rich piRNA-producing loci. (A) PERLs as a proportion of all zebrafish chromosomes. (B) Size distribution of PERLs. (C) Expression levels of PERLs across the different time points. Significance was tested with a Wilcoxon test. (D) Fraction of PERL base pairs that overlap with either A or B compartments. The number of genomic bases that belong to either of those compartments is also shown for comparison. (E) piRNA density (in RPKM) of PERLs compared with non-PERL loci, at the indicated time points. (F,G) Fraction of PERL bases that overlap with (F) RNA or (G) DNA transposons. Background is a set of size- and chromosome-matched random regions.
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