Characteristics of piRNA sequences (24–29 nt). a Percentages of 1U and 10A signatures in bona fide and in TE piRNAs in An. gambiae.
b Percentages of 1U and 10A signatures in bona fide and in TE piRNAs in D. melanogaster. c 5′ ends of complementary piRNAs of An. gambiae frequently exhibited a 10-bp overlap (the ping-pong signature) in all piRNA genome-mappers. d Nucleotide abundance in the 10-bp overlap section of ping-pong piRNA partners in An. gambiae