MicroRNA Biogenesis Is Required for Mouse Primordial Germ Cell Development and Spermatogenesis - Hayashi, K; Lopes, SMCDS; Kaneda, M; Tang, F; Hajkova, P; Lao, K; O'Carroll, D; Das, PP; Tarakhovsky, A; Miska, EA; Surani, MA (PLOS ONE, 2008)