2003). cycle arrest at G1/G0. We speculated that Nanos2 would be involved in this mitotic arrest and, to test this hypothesis, we examined the mitotic activity of male gonocytes by double-immunostaining with anti-phosphorylated histone H3 (pH3, an M-phase marker) and TRA98 (a germ cell marker) (Fig. 1ACD). Although no significant pH3-positive cells could be recognized […]