(A) MIWI piRISC loaded with a 2′-O-methyl, 5′-32P-radiolabeled, synthetic, 45-nt pre-piRNA was incubated in Pnldc1em1/em1 testis lysate. A representative experiment is shown, the lifetime is mean ± SD (n = 3).
(B) Frequency of 5mers in all pre-piRNAs or in unstable pre-piRNAs in FACS-purified Pnldc1em1/em1 mouse primary spermatocytes. A representative experiment is shown.