piRNA profiling during specific stages of mouse spermatogenesis

Annotation of a PRMR gene, Sp1, with piRNAs from the cell types and antisense transcripts identified by SAGE tags and ESTs, as well as splicing isoforms. (A) The distribution of piRNA reads on the sp1 locus in three cell types. piRNAs are enriched in the 3′ UTR. (B) (Solid bars) Antisense SAGE tags identified from the testis and antisense transcripts. (C) The structure of five sp1 isoforms with exons mapped to the plus strand of chromosome 15.