Figure 1.

Photomicrographs of double-immunostained sections from a rat belonging to the PS-Recovery condition. A, Three double-labeled MCH+/Fos+ cells with their cytoplasm colored in brown and their nucleus labeled in black and one single labeled MCH+ cell. B, Fos+ (with a black nucleus) and hypocretin (with a brown cytoplasm) single labeled cells. Scale bars: 20 μm.