Before revision: In 2003, piRNAs derived largely from repeated sequence elements, including transpsons , were found in abundance in male and female Drosophila germlines (Theurkauf, 5).
After revision: In 2003, piRNAs derived largely from repeated sequence elements, including transposons , were found in abundance in male and female Drosophila germlines (Theurkauf, 5).