Fig. 12. Freeze fracture replica of a rat lens cortical fiber cell. The image encompasses the width of an entire fiber. The large number of fiber cell junctions is apparent. Although this field is deceptively rich in gap junction, it illustrates the unusual numbers of such junctions that can be found between cortical fiber cells. (× 11,500.) (Fitzgerald PG, Bok D, Horwitz J: The distribution of the main intrinsic membrane polypeptide in the ocular lens. Curr Eye Res 4:1204, 1985)