Fig. 4From: Monochromatic green light stimulation during incubation shortened the hatching time via pineal function in White Leghorn eggsEffect of monochromatic green light stimulation on the histological structure of pineal gland follicle related indicators including wall thickness (a), follicle area (b), and lumen area (c) from d 10 to 18 post incubation. The data are presented as mean ± SEM (n = 6 per group). * P < 0.05; ** P < 0.01Back to article page