Fig. 2
From: Effects of nicotinamide on follicular development and the quality of oocytes
Effects of different concentrations of NAM on oocyte maturation and fertilization. The effect of NAM on cumulus expansion was observed using a light microscope (a). Percentages of oocytes matured (b) and fertilized (c) in vitro following treatment with NAM. d, f Representative images of mature and immature oocytes. Pronucleus formation in fertilized oocytes (e). PB: Polar body; GV: germinal vesicle. Values are significantly different between groups (*P < 0.05, **P < 0.01). Scale bar = 200 μm