Fig. 5.

Electron microscopic analysis of photoreceptor cells of β2/β1^+/+ and β2/β1^ki/ki mice. Ultrathin sections through retinae of 4-month-old β2/β1^+/+(a) and β2/β1^ki/ki(b) mice. Note that the length of inner and outer segments of photoreceptor cells in β2/β1^ki/kianimals (b) is significantly reduced when compared with β2/β1^+/+ littermates (a). ELM, External limiting membrane; IS, inner segments; ONL, outer nuclear layer; OS, outer segments; P, pigment epithelium. Scale bar (shown in b fora, b): 5 μm.