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. Author manuscript; available in PMC: 2009 Nov 1.
Published in final edited form as: Cell. 2009 Apr 23;137(3):509–521. doi: 10.1016/j.cell.2009.04.027

Figure 7.

Figure 7

A model for piRNA biogenesis. The Aub- and Ago3-dependent piRNA amplification cycle is envisioned to operate only in the germ line, whereas a Piwi-dependent, Aub- and Ago3-independent pathway is shown for somatic cells. In the germ line, Piwi can also partner with Ago3 to amplify piRNAs.